List of Ben 10 characters
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- 1 Main characters
- 2 Antagonists
- 3 Secondary characters
- 3.1 The Plumbers
- 3.2 Plumber's Helpers
- 3.3 Azmuth
- 3.4 Ship
- 3.5 Paradox
- 3.6 Jimmy Jones
- 3.7 Aggregor's Prisoners
- 3.8 Sir George
- 3.9 Alternate Versions of Ben Tennyson
- 4 Other characters
- 4.1 Big Ed
- 4.2 Cash and JT
- 4.3 Lt. Steel
- 4.4 Tetrax Shard
- 4.5 Xylene
- 4.6 The Galactic Enforcers
- 4.7 Myaxx
- 4.8 Carl & Sandra Tennyson
- 4.9 Baz-El
- 4.10 Verdona Tennyson
- 4.11 Frank Tennyson
- 4.12 Natalie Tennyson
- 4.13 Reinrassic III
- 4.14 Elena Validus
- 4.15 Victor Validus
- 4.16 Colonel Rozum
- 4.17 Eunice
- 4.18 Winston
- 4.19 Ignatius Baumann
- 4.20 Zed
- 4.21 Pakmar
- 4.22 Professor Blarney T. Hokestar
- 4.23 Pax
- 4.24 Kraaho
- 4.25 Hobble
- 4.26 Rad Dudesman
- 4.27 Scout
- 4.28 Skurd
- 4.29 Todd
- 4.30 Sally
- 4.31 Shady Looking Dude
- 4.32 Steve
- 4.33 Bill
- 4.34 Glamour Man
- 4.35 Starshine
- 5 References
- 6 External links
- Tara Strong - Ben 10 (as 4 and 10 years old), Ben 10: Ultimate Alien (as 10 years old in "Forge Of Creation"), Ben 10: Omniverse (as 5, 10, and 11 years old), and Ben 10 (Reboot; 10 years old and toddler)
- Yuri Lowenthal - Ben 10: Alien Force, Ben 10: Ultimate Alien, Ben 10: Omniverse (15 and 16 years old) and Ben 10 (Reboot; Elderly)
Benjamin Kirby Tennyson (alias "Ben 10") is the main protagonist of the franchise. He is a 10-year-old boy[note 1] from Bellwood who found the Omnitrix, which attached onto his wrist and gave him the power to become different aliens. He uses these powers to defeat evil while trying to escape the alien warlord Vilgax, who chases him to retrieve the Omnitrix.
At the start of the series, Ben is introduced as a self-centered and cocky boy. At first, he only helped people just so he could feel like a hero, leading Gwen, Max, and others to doubt him and they wonder if he has what it takes to be a hero and if he should be holding the power of the Omnitrix. As the series progresses, however, Ben matures and becomes a capable leader in the sequel Alien Force due to Grandpa Max's disappearance and the threat of the Highbreed invasion. Despite his immaturity, Ben's actions are motivated by a sincere will to help others; he'll stop at nothing to protect his family and anyone in danger. Though often thought of by others as being stupid, Ben proves to be smart and clever when needed, usually showing good skills when the Omnitrix doesn't provide him with the form he wanted.
At some point between the two shows, Ben had removed the Omnitrix and spent several years without it, because he chose to give up his superhero career to have a normal life. However, when Ben found out that Max had mysteriously disappeared, he decided to use the Omnitrix again to find Max. After defeating the Highbreed, Ben grew famous and was celebrated as a hero, which caused him to eventually return to his immature personality. To make it worse, Ben also lost Azmuth's trust after a failed attempt to hack the Omnitrix and unlock its full potential.
Ben also discovers that himself, his cousin Gwen, his father Carl, and his uncle Frank have heritage from an alien species called Anodites, though it is a dormant gene within him and he does not have the same potential that Gwen does. However, in the episode “Ben 10,000 Returns”, it is shown that he can utilize magic to some degree, as he produced an energy shield to block Eon's aging ray.
In the series finale of Alien Force, Ben lost the Omnitrix to Vilgax and was later forced to self-destruct it. He then successfully took the Ultimatrix, a redone version of the Omnitrix, from his evil doppelganger Albedo. In addition to the original Omnitrix's shapeshifting powers, the Ultimatrix gives Ben the power to turn into more powerful “Ultimate” forms of his aliens. In Ultimate Alien, the public learns Ben's secret identity and he becomes a megastar superhero.
In Omniverse, Ben is assigned a new partner by the Plumbers, Rook Blonko, as Gwen left for college with Kevin. Ben also learns of Undertown, where aliens live under Bellwood. After seeing the birth of a universe at the end of the series, Ben decides to take a galactic trip with Rook, Kevin, and Gwen.
- Meagan Smith - Ben 10 (10 years old)
- Ashley Johnson - Ben 10: Alien Force, Ben 10: Ultimate Alien, and Ben 10: Omniverse (11, 15, and 16 years old)
- Montserrat Hernandez - Ben 10 (Reboot; 10 years old and toddler)
Gwendolyn Catherine "Gwen" Tennyson is Ben's 10-year-old paternal cousin. She is fifteen years old in Alien Force and sixteen years old in Ultimate Alien and Omniverse.
In the original series, Gwen shared a love-hate family relationship with Ben. Before discovering her dormant magic powers, she helped Ben using her innate intelligence; she is also a talented martial artist who has received black belts in karate and taekwondo. Gwen is a model student, and in Omniverse, she is shown leaving for an Ivy League College.
Overall, her most notable skill is her strong magical abilities. Possessing what Charmcaster calls a "magical aura", Gwen can use various magic artifacts, charms, talismans, spell books, and spells. On two occasions, Gwen has used the Charms of Bezel to become a superheroine named "Lucky Girl". At first, her magical ability drew from the luck-granting Charm of Bezel; while wearing the charm, any action she took would result in a beneficial chain reaction that often injured Ben in the process. She later revived her superheroine identity after obtaining the Keystone of Bezel, which strengthened her natural abilities to superhuman levels and granted her superhuman agility, stamina, and endurance. She was later forced to retire when the Charms of Bezel were destroyed. She can manipulate pink/magenta energy to create energy blasts, shields, barriers, ropes, chains, stepping stones, and other weapons and items. She later learns that her powers are not magic in origin, but rather alien, and her paternal grandmother, Verona, is a powerful Anodite alien who can manipulate mana, the essence of magic and life itself. Gwen can take on an Anodite energy form when she gets very angered, enraged or stressed. In the mystical world of Ledger Domain, Gwen's innate magical and Anodite powers are both further magnified to even greater levels.
In Omniverse, she becomes a supporting character instead of a main one, having decided to go to Ivy League College accompanied by her boyfriend Kevin. She frequently visits Plumber Headquarters and sometimes uses her magic to help fight any bad guys she comes across. She is now capable of transforming between her human and Anodite form more freely, but mostly when she gets really angry or whenever the situation becomes too dire.
- Paul Eiding - Ben 10, Ben 10: Alien Force, Ben 10: Ultimate Alien, and Ben 10: Omniverse (54, 59-60, 60-61, 64-65, and 65–66 years old)
- Adam Wylie - Ben 10 (10 years old in "Don't Drink the Water")
- Jason Marsden - Ben 10: Ultimate Alien (17 years old in "Moonstruck")
- David Kaye - Ben 10 (Reboot)
Maxwell "Max" Tennyson is the 60-year-old[note 2] paternal grandfather of Ben and Gwen. Despite his age, Max has shown on multiple occasions to be a formidable fighter. He takes his grandson Ben gaining superpowers in stride and supports him in any way he can. Max was once a candidate for the Apollo 11 mission and one of the leaders, or "Magisters", of the Plumber organisation, but Ben and Gwen did not know of this at first, believing him to have been a literal plumber. Before Ben got the Omnitrix, Max tried to keep the Plumbers a secret from his family to protect them, but his plan failed when the Omnitrix and Vilgax came to Earth. Max drives a recreational vehicle nicknamed the "Rust Bucket" that conceals a wide range of Plumber weapons and technology.
Max is an old friend of an alien named Xylene, who has flight, telepathy, and telekinesis abilities. She intended to send the Omnitrix to Max, but Ben found it instead. He also had a close romantic relationship with an Anodite alien named Verdona. They ended up having two sons, Carl (Ben's father), and Frank (Gwen and Ken's father).
In Alien Force, Max plays a part in exposing the Highbreed conspiracy. He destroyed a Xenocyte hatchery by detonating a Null Void Projector, which, after removing its focusing lens, produces an explosion that covers over half a mile wide. Max appeared to have been killed in the blast, but was instead sent to the Null Void where, calling himself "The Wrench", he fought against Doctor Animo. Once the conflict was over, Max trained a new group of young Plumbers while at the same time informed Ben and the team of any alien threats.
- Michael Reisz - Ben 10 (11 years old)
- Charlie Schlatter - Ben 10 (11 years old in later episodes)
- Greg Cipes - Ben 10: Alien Force, Ben 10: Ultimate Alien, Ben 10: Omniverse, and Ben 10 (Reboot) (11, 12, 16, and 17 years old)
- Nathan Keyes - Ben 10: Alien Swarm
Kevin Ethan Levin is an 11-year-old[note 3] Osmosian who first appeared in the series as one of Ben's enemies, but reformed as his best friend and Gwen's love interest. Believing his stepfather Harvey Hackett convinced his mother to abandon him after he accidentally destroyed his family's house when his powers first manifested, Kevin ran away and ended up living in the subway of New York City, where he met Ben and used him to siphon the Omnitrix's energies to get back at those who demonized him. However, Kevin was also infused with the DNA of the aliens Ben had access to at the time and became a chimeric hybrid of the alien forms, which rendered him psychotic and unstable.
Later in the series, Kevin ends up in the Null Void where he manages to regain his normal form and master his abilities under the guidance of a fellow inmate. He then escapes and is found by the Rooters, who train him and use his power to turn themselves and the Plumbers Kids into alien-hybrids to further the organization's plan to assassinate Ben. This attempt later ends in failure with Kevin's memories altered to have no recollection of the Rooters, which makes him believe his father was an alien involved with the intergalactic black market. Despite lacking a formal education, Kevin possesses a vast knowledge of alien life and paraphernalia. While teaming up with Ben and Gwen during the Highbreed invasion of Earth, the false memories of his father influence Kevin to reconcile with Ben and, over time, he becomes involved in a romantic relationship with Gwen. Kevin has a muscle car, based on a 1970's Dodge Challenger armed with Plumber and other alien technologies.
Although he turned over a new leaf, Kevin still occasionally acts out of self interest and has trouble forgiving others. During Vilgax's challenge to Ben, Kevin accidentally mutates himself into a living colossus composed of steel, tadenite, concrete, and wood, using one of the I.D. masks developed by DNAliens to appear human. During this second mutation, he can turn his limbs into makeshift weapons at will. When the Omnitrix is destroyed, Kevin reverts to normal, but retains his ability to shapeshift.
During the events of Ultimate Alien, Kevin absorbs the Ultimatrix's energy to stop Ultimate Aggregor, sacrificing his mental stability in the process and becoming a monstrous combination of Ben's most recent aliens. Kevin goes on a revenge spree against anyone who wronged him, despite still retaining some of his heart and humanity. In the two-part episode "Absolute Power", Kevin absorbs the abilities of Alan Albright, Manny, Helen, Pierce, and Doctor Viktor whom he placed in a comatose state. In a last stand in Los Soledad, Ben finally defeats Kevin and restores him to human form.
During the events of Omniverse, Kevin leaves Bellwood when Gwen moves to Ivy League College and eventually returns as a recurring character while becoming good friends with Rook. In "Showdown", he adopts Zed who was abandoned by Khyber and became his pet. However, in "The Rooters of All Evil", Kevin regains his memories of the Rooters and manages to escape them while going on a mission to restore the memories of everyone else involved while confronting Proctor Servantis. However, Ben's interference forces Kevin to bide his time to catch Servantis off guard and break his psionic hold on Alan, Manny, and Helen. By that time, Kevin learned to maintain his sense of self when absorbing Omnitrix energy.
In the reboot series, Kevin is a bully of Ben's who developed a knock-off of the Omnitrix called the Antitrix after gaining the Omnitrix blueprints in a dream. First appearing in the third season, Kevin is recruited by the Forever Knights, who exploited his feelings for Gwen.
- Wreckingbolt - Cannonbolt, first seen in "This One Goes to 11."
- Quad Smack - Four Arms, first used in "Which Watch".
- Rush - XLR8, first seen in "Introducing Kevin 11."
- Skunkmoth - Stinkfly, first seen in "Introducing Kevin 11."
- Crystal Fist - Diamondhead, first seen in "Franken-Fight."
- Bootleg - Upgrade, first seen in "Franken-Fight".
- Hot Shot - Heatblast, first seen in "Buggy Out."
- Dark Matter - Grey Matter, first seen in "King of the Castle".
- Thornblade - Wildvine, first seen in "Buggy Out."
- Undertow - Overflow, first seen in "Buggy Out."
- Bashmouth - A wolf-like alien that can generate metal to increase his offense and defense, first seen in "Introducing Kevin 11."
- Bumper Robinson - Ben 10: Omniverse
Rook Blonko is a Revonnahgander from the planet Revonnah. He is a Plumber who was assigned to Ben by Max after Gwen and Kevin left. According to Revonnahgander tradition, Blonko is actually his name because Revonnahganders have their last name first, similar to Earth eastern customs.
He is a top Plumber Academy graduate and a highly skilled fighter. He possesses many Plumber weapons and technology, such as the Proto-tool, a shapeshifting weapon that turns into a sword, bow, grappling hook, blaster, etc.
Rook is an extremely skilled fighter with advanced knowledge and training, but he has no actual experience and treats Ben as a superior rather than a friend or partner. Rook has limited Earth cultural knowledge and an inability to understand sarcasm, in contrast with Ben's wise-cracking personality.
Towards the end of the series, Rook's performance as a Plumber resulted in his promotion to the rank of Magister. In the future seen in "The End of an Era," he is to assume the office of Magistratus, previously held by Max. By this point, Rook understands metaphors well and uses his original lack of understanding them as a joke between him and Ben.
- Tara Strong - Ben 10 (Reboot)
Glitch is a hybrid created as the result of Ben using Upgrade to enhance the Omnitrix in "Omni-Tricked", destroying the Galvan Mechamorph strain as part of it fused with a sample of Ben's human DNA. While inheriting his donor's playful nature and stubbornness, Glitch is far more patient and serious with a large amount of knowledge of the Omnitrix's functions. In the aftermath of "Innervasion", Glitch transferred into the Rustbucket and enhanced it while welcomed as a new addition to the family.
The Plumbers are a special police force that operate in the universe. While some work on Earth, most work in different parts of the universe.
Among the known Plumbers are:
- Jeff Bennett – Ben 10: Alien Force and Ben 10: Ultimate Alien (flashback)
Magister Labrid is a plumber who appears in the two-part episode "Ben 10 Returns". He is an unspecified fish-like alien in a water-filled suit who was Grandpa Max's partner. He first appeared before Ben and Gwen when he thought that Ben stole the Omnitrix, he was taken down by Gwen when he tried to attack Ben, the three of them stakeout a weapons trade held by Kevin between the DNAliens and the Forever Knights, they managed to take down Kevin while the DNAliens and the Forever Knights got away. During the second fight with the Forever Knights, he was mortally wounded protecting Kevin which ended up damaging his suit enough to leak. Kevin states that he has some tape to repair it, but he denies Kevin's request. Before he evaporates, Magister Labrid tells Ben, Gwen, and Kevin to complete their mission to stop the DNAliens.
Master Labrid also appears in a flashback in "Moonstruck" in which Grandpa Max recalls meeting Verdona for the first time and to help stop the Synthroid. In this episode, Max reveals that Magistar Labrid recruited him to the Plumbers.
Magister Prior Gilhil
- J.K. Simmons - Ben 10: Alien Force and Ben 10: Ultimate Alien
Magister Prior Gilhil is a Plumber. He first appears when he encounters Ben, Gwen, and Kevin. Seeing as he hasn't considered the Highbreed a threat, he tells them to not get involved with the Plumbers. Darkstar later tips him off to a fight between Ben Tennyson and a Highbreed Lord, and he also ends up captured by Darkstar. After Gwen and the DNAliens defeat Darkstar, Magister Prior Gilhil made them honorary plumbers and then arrested Darkstar.
Magister Prior Gilhil reappeared in "Escape From Agreggor", where in a flashback; he ended up answering a distress signal coming from Aggregor's ship. When he finds the five captive aliens during an inspection, he ends up knocked out and killed by Aggregor who used his charged-up staff on him. This explained how Aggregor was in his outfit and his ship when he recaptured Galapagus.
- Rob Paulsen - Ben 10: Ultimate Alien and Ben 10: Omniverse
Magister Patelliday is a Pisccis Volanns Plumber who is the second-in-command of the Plumbers of Earth. He looks like the other Pisccis Volanns, but he wears glasses. He originally only appears in "Mother of All Vreedles" to arrest Ma Vreedle.
He reappears in Omniverse, making cameos in "The More Things Change" and "A Jolt from the Past." In "Gone Fishin", Magister Patelliday is kidnapped by pirates and rescued by Ben and Rook.
This group is made of the children of Plumbers, most of which are superpowered alien-human hybrids. Max trained them after the Highbreed war; they eventually became his pupils. In the season 3 premiere, Max and the other Helpers try to take down Vilgax in the park but they were stomped out of the way. The Helpers returned in the Ultimate Alien episode "Absolute Power", with Kevin draining all but Cooper of their powers.
- Cathy Cavadini – Ben 10
- Corey Padnos – Ben 10: Alien Force
- Chris Pratt – Ben 10: Ultimate Alien
- Eric Bauza – Ben 10: Omniverse
Cooper Daniels, who first appeared in the original series, is a technological genius, partly due to his ability to merge with, control and communicate with machinery. Cooper appears again in Ben 10: Alien Force, where he has become considerably obese due to spending too much time in his lab on the computer. The DNAliens capture him in and force him to use his powers to build a mysterious arch and a holographic projector to hide it. He is released by Ben, Gwen and Kevin, and destroys the projector. Cooper has since developed a crush on Gwen, which she can't help but be annoyed about. Although Kevin usually shows jealousy when other boys crush on Gwen, he's surprisingly good-humored towards Cooper's feelings. In "War of The Worlds", after studying the Omnitrix's ability to restore the DNAliens to human, he created an energy blaster with the same the effect.
In Ultimate Alien, Cooper has shown to have had a growth spurt and is now considerably taller and more muscular. While unknown to what degree, he was shown to have gained strength after his growth spurt, as he was strong enough to plow through a wood wall. In the episode "Absolute Power", he helps in creating a device that would cure Kevin of his amalgamated form. He reappears in "Prisoner #775 is Missing", where it's revealed he has become a Plumber.
A quartet of children who were revealed in Omniverse to have been orphans subjected to experiments by the Rooters through Kevin's Osmosian powers to being hybrids for the purpose to assassinate Ben. However, the attempt on Ben's life failed and the Amalgam Kids' memories of the Rooters were wiped and were placed under the delusion that they were born alien hybrids as they were eventually placed as Ben's allies by the Rooters to serve as sleeper agents.
In "Above and Beyond", as a test to see if they are ready to be official Plumbers, Max and Ben came up with a plan to trick Helen, Pierce, Manny, and Alan into believing that Ben had gone rogue, and attacked his grandfather aboard a satellite. Each member of the Plumber's Helpers had initially decided to go on their own to stop Ben, but they were only able to defeat him when they worked together. Unfortunately, their battle with Ben had caused the satellite to fall towards Earth. To prevent the deaths of thousands, Helen, Pierce, Manny, and Alan decide unanimously to sacrifice their lives to cause the satellite to self-destruct. Max appeared in time to stop the self-destruct, stop the satellite from colliding with Earth, and tell the Plumber's Helpers that they had passed the test and were on their way to Plumber's Academy.
By the events of the two-part Omniverse episode "Weapon XI", Pierce having been killed off in the Ultimate Alien series, the remaining Amalgam Kids regain their memories while forced to fight Ben and their friends before Kevin breaks Proctor Servantis' hold over them.
Alan Albright is a former Rooter agent who was infused with Pyronite DNA and his memory was altered to make him believe he was born a hybrid. He wears his Plumber's Badge on his chest that was inherited from his father, who appeared to be a Pyronite from his altered memories. Unlike the others, Alan's transformation is perfected so that he can return to human form at will while gradually able to master his Pyronite abilities.
- Juliet Landau - Ben 10: Alien Force and Ben 10: Omniverse
Helen Wheels is Pierce's adoptive sister, later revealed to have been a former Rooter agent who was infused with Kineceleran DNA with her memory altered to believe she was born a hybrid.
She was originally part of a small team in the episode "Plumber's Helpers", young plumbers' apprentices, with Pierce and their friend Manny. Helen is smart, brave, kind and level-headed, though at times she usually tries to act rational and wise, making her mostly a mirror image of Gwen, usually prefers a more careful and less aggressive approach, causing occasional argument between her and Manny, sharing a love-hate relationship with him, and she might have a crush on him. Helen has quite skilled with computers and technology and has the same abilities as XLR8, as well as a visor, though it only covers her eyes.
Helen and Manny used to hunt all sorts of aliens they confused for criminals whom they would throw into an old Null Void projector, which they've mistaken for a disintegration weapon. Manny convinced Helen that Ben, Gwen and Kevin, were DNAliens, but the confusion is eventually cleared up after Ben proves that the Null Void projector wasn't a disintegration weapon. To rescue those they may have falsely imprisoned, because part of those they captured probably were Plumbers' kids, Helen and Manny travel into the Null Void. Later, Helen telepathically contacts Gwen for help against Dr. Animo, which Ben provides.
- Khary Payton – Ben 10: Alien Force and Ben 10: Omniverse
Manny Armstrong is a young man who is revealed to have been a former Rooter agent who was infused with Tetramand DNA with his memory altered to believe he was born a hybrid.
Manny is like Kevin, hot-headed, aggressive, a rebel and sometimes cocky, often willing to fight even when it may be not necessary. He shows an anti-hero personality and is stubbornly dedicated to their mission, immediately assuming that Ben, Gwen, and Kevin are DNAliens, he lacks his mirror's laid back attitude, often permanently angry and insulting to even his own allies, earning him the dislike of Kevin and Ben and forcing Helen to act as peacekeeper. Manny is finally convinced to listen after being brought down by Ben, after learning the error of their ways, Helen and Manny travel into the Null Void to search for those they've wrongly imprisoned.
He shares a love-hate relationship with Helen. When confronted with Helen's wiser personality as opposed to his hot-headed attitude, it causes them to fight often, though he is shown to truly care about her, as he was willing to attack Ben after he hurt her in "Above and Beyond". Several hints suggest Manny might have a crush on Helen in nearly all of their appearances.
Later in the Null Void, Manny is one of the resistance fighters battling Dr. Animo, a past battle cost him a hand, which has been replaced with a crude clamp. Much to Max's annoyance, he insists on calling the new team "Max Force", in addition to his Tetramand powers, Manny also carries plasma beams guns.
- Adam Wylie – Ben 10: Alien Force and Ben 10: Ultimate Alien
Pierce Wheels is the adoptive brother of Helen, revealed to have been a former Rooter agent who was infused with Argit's DNA with his memory altered to believe he was born a hybrid. He has the ability to sprout quills from anywhere on his body, combining it with his martial art skills. He first appears in a recorded journal having reportedly died in the "disintegration weapon" during a mission while working with Helen and Manny, but it is later revealed that he was actually sent to the Null Void, presumably through the projector they had been using to dispose of DNAliens and a number of other aliens.
Ben is forced to spar with Pierce to see "The Wrench" (who actually is Grandpa Max) and loses, though Pierce later finds out that Ben let him win in order to be allowed to see the Wrench.
Pierce re-appears in the Ultimate Alien episode "The Purge", where he used an ID mask to pose as a human go on a date before being confronted by two Forever Knights members who beat him to death while he refused to be intimidated in leaving Earth. Pierce is posthumously mentioned in the Omniverse episode "Weapon XI" when Kevin and the surviving Amalgam Kids want to honor his memory by resuming their intended mission.
- Tara Strong – Ben 10 and Ben 10: Omniverse
Lucy Mann is a member of a race of shapeshifting aliens, the Lenopans, who have been at war with the Plumbers for many years. Common traits include the ability to alter their appearance and expand their limbs, though they are very weak to water.
In the original series, Lucy briefly appears in "My Big Fat Alien Wedding", as she is the flower girl in the wedding between her aunt Camille and Ben's uncle Joel as part of creating a truce between the warring groups. Near the end of the episode, Ben shares a dance with Lucy only to accidentally trip on her muddy feet.
In Omniverse, Lucy makes a full appearance in "Mud Is Thicker Than Water". Having become the first-ever Sludgepuppy Plumber, Lucy is partnered with Ben and Gwen in uncovering a mole within the Plumbers' ranks. During the investigation, Lucy vanishes frequently and unintentionally brings suspicion on herself, but she proves herself as a true Plumber by uncovering the real mole a Tetramand named Gorvan who has been stealing weapons for Psyphon. When it came to fighting Psyphon and his minions, Lucy assumed the form of Vilgax to scare him resulting in Psyphon getting apprehended by the Plumbers. She also appeared in "From Hedorium to Eternity" where she joined forces with Ben, Gwen, and Kevin to thwart an Ectoneurite invasion led by Zs'Skayr.
- Vyvan Pham - Ben 10: Alien Force, Ben 10: Ultimate Alien and Ben 10: Omniverse
Julie Yamamoto is an Asian girl and tennis champion who was in the same school as Ben, first appearing "Ben 10 Returns, Part One". She eventually went on to become Ben's love interest and girlfriend; she enjoys tennis, eating chili fries, and caring for her pet, Ship (a Galvanic Mechomorph which was found by her and Ben), since she's an ordinary human, Julie doesn't possess any superpowers herself, but hows some fighting skill when she took on one of the Forever Knights. Julie is the only one who can fully understand and command Ship, as revealed when Ship showed that he can "merge" with Julie and becomes an armored battle suit, with which she demonstrates enhanced strength and great resistance to damage, as well as the ability to fire powerful lasers.
Throughout the series, Julie has been portrayed as normally kind, cheerful, spirited and good natured, but Julie can at times be very trying in that she gets jealous easily, is competitive and at times vindictive, stubborn to a fault, and very firm in the expectations she sets for herself. She tries her best to be supportive of Ben but is often uncertain that he is truly supportive of her in the same way.
Julie first appears, where she congratulates Ben after his team won a soccer game. She introduces herself and agrees to meet him at school the next day after; Ben soon asked Julie out on a date' in "Pier Pressure" but it was interrupted by Ship, who kidnapped Julie. During a rescue attempt, Julie found out about the Omnitrix, which she found to be cool and wasn't scared. In the end, it was revealed that Ship was trying to lead Ben to his creator Baz-El, whose spaceship crashed and was about to explode. Ben and Julie helped fix Baz-El's spaceship, and ended up getting closer in the process while Baz-El left Ship with them, saying that he and Ben have a bond. Soon after it was revealed that Julie was keeping Ship as a pet; it put a strain on her relationship with Ben, as he feared Ship could do something that she couldn't handle. The Forever Knights kidnapped Ship, planning to use him to mass-produce spaceships for them. Julie managed to get through to Ship and bring him back to his senses; Julie would then allow Ben and the others to use Ship's new spaceship form if they asked her for traveling. In Ultimate enemy Julie was luckily saved by ship from diagons midn control wave and therefore she didn't transform into a esoterica and escaped tennis stadium .Julie and Ben continued to have a relationship with ups and downs but never wavered through it all and eventually kissed; but soon after' sometimes between ultimate enemy Ben accidentally broke up with Julie over the phone while he was playing video games and Julie misunderstood him she eventually found another boyfriend named Hervé. As soon as that happened they all got kidnapped along with Ester and Rook by Princess Looma. Julie fought back against Looma with the help of Ball Weevil and Ship; Ben and Julie then made an agreement to be friends after their break-up.
She later appears in "The Most Dangerous Game Show" as one of the females chosen to compete for Ben's hand in marriage. She is utterly uninterested in the contest, texting Hervé for the duration. This causes her to get knocked into the water during the "hole in the wall" round. After being sent to the Null Void with the other losers, she is later freed and returned to Earth safe and sound.
- Bettina Bush - Ben 10 and Ben 10: Omniverse
Kai Green is a Native-American girl whose grandfather Wes Green is a former Plumber operative. She first appears in "Benwolf", running one of their traditional dances where Ben falls in love with her at first sight. They grew closer as Ben helped stop the Loboan from causing havoc in her village, especially when he appeared to be turning into a Yenaldooshi. However, after Ben had fully scanned the Loboan DNA and returned to human form, Kai broke his heart as she was only interested in him as a Yenaldooshi and she could train and tame him but Gwen says she can't talk to him like that. In the episode "Perfect Day" she makes a cameo as a cheerleader in Ben's dream.
Kai returns in the Omniverse episode "An American Benwolf in London". She comes to London to help her grandfather keep the Chadwick and the Forever Knights from obtaining Excalibur. Kai turns up again in the series during "Fight in the Museum" where it is revealed that she became Ben's wife in the future. Kai later appears in "Secret Of Dos Santos" where she, Ben & Rook try to secure an artefact which could bring an end to the Time War. She then appears again in "Most Dangerous Game Show" fighting to be Ben's wife, and she and Ben accidentally share a kiss. Her future self appeared in the first part of the Omniverse series finale, married to Ben, with a son Kenneth Kenny Tennyson, and now wielding Excalibur in battles with villains.
- Robert David Hall – Ben 10
- Jeff Bennett – Ben 10: Alien Force and Ben 10: Ultimate Alien
- René Auberjonois – Ben 10: Omniverse
- David Kaye – Ben 10 (Reboot)
Azmuth is a thousand year old Galvan who created the Omnitrix and the Galvanic Mechomorphs. A thousand years ago, he was in a relationship with a female Galvan named Xenith; the planetary system they saw in perfect alignment inspired Azmuth to create Ascalon, which can tap into the fundamental forces of the universe. Besides losing Xenith's love, Azmuth realized too late the consequences of creating such a weapon when Ascalon fell into the hands of an Incursion who ended up unintentionally destroying his homeworld in an attempt to end the civil war on it. A distraught Azmuth vowed to hide the sword and gave it to Sir George, who used the weapon to defeat Diagon.
Soon after, Azmuth dedicated himself to peaceful sciences as his penance to the universe and Xenith, creating the Omnitrix as a tool of peace. But Azmuth became disgusted when those like Vilgax saw its possible uses as a weapon. This causes Azmuth to go into hiding before being found by Ben who needed his help to deactivate the Omnitrix's self-destruct sequence, convincing him there is still hope for the universe. Since then, Azmuth became more optimistic as he attempted to make up for lost time such as attempting to aid Malware as shown during the events of "Trouble Helix".
In Alien Force, Azmuth's former assistant Albedo creates a copy of the Omnitrix. After the copy nearly destroyed a galaxy, Azmuth shows up and punishes Albedo by breaking his Omnitrix, leaving him de-powered and trapped in Ben's human form, before sending him to prison. He then stated that Ben is the only one who used the Omnitrix for good, and decides to let him find his own way to use it rather than advise him, saying that he has far more difficult challenges ahead and that he isn't the only one who believes Ben is the only one who thinks so. Later, as Galvan Prime was conquered and destroyed, Azmuth and Paradox warn Ben that the Highbreed are conquering planets and their fleet is heading towards Earth. Although Azmuth preferred Ben not joining the fight, he see no point in stopping him and activates the Master Control for the sake of the battle. When the Master Control was reset by the DNA wave Ben used to stop the Highbreed, Azmuth left to help rebuild Galvan without reactivating it. He shows a no-nonsense attitude towards the High-Breed's plan to eradicate Earth and he warmly tells Ben that there are more difficult battles to be fought in the future.
Following Diagon's defeat, Azmuth removes the Ultimatrix and places a new perfected Omnitrix on Ben. When asked by Ben if he is ready to learn the Master Code, Azmuth states that he'll consider this by Ben's 18th birthday. During Omniverse it was revealed that Azmuth was responsible for the accidental creation of the Galvanic Mechamorphs, including the corrupt one he dubbed Malware. He made efforts to repair Malware but failed, and Malware's impatience turned to hatred for his creator. This would lead to him forming an alliance of villains in an effort to eliminate Azmuth, who would also have to contend with Albedo.
The film Ben 10: Destroy All Aliens introduces Azmuth's father (voiced by Troy Baker), who comes to Earth in search of Azmuth after he disappears en route to a rendezvous with Ben. Clad in Mechamorph Armor created by Azmuth, he becomes dangerously unstable and battles Ben and a mysterious Tokustar, who later proves to be Azmuth mutated by the malfunctioning Omnitrix. When everything is set right, Azmuth's father is revealed to appear younger than his son; this is due to Azmuth transferring his father's mind into a cloned body.
- Vyvan Pham - Ben 10: Alien Force, Ben 10: Ultimate Alien and Ben 10: Omniverse
Ship is a symbiotic of canine behavior produced by a Galvanic Mechomorph named Baz-El. He possesses the same powers as Upgrade, but can also alter his form to mimic any device he has come into contact with. Ship first introduced in "Pier Pressure", where since there, he became Julie's pet, after Baz-El gave him to her. He can shapeshift into different shapes and forms of technology, from his spaceship form to a protective battle armor employed by Julie. He could also sense diagons mind control wave when Julie was playing tennis with her opponent Carol Smith and ship quickly just in time merged with Julie to protect her and luckily Julie didn't become a esoterica while Carol Smith and the humans at stadium transformed Carol Smith and many humans attacked Julie and ship but they flew far away from the stadium
- David McCallum - Ben 10: Alien Force, Ben 10: Ultimate Alien, and Ben 10: Omniverse
Professor Paradox is a biologically immortal time traveler who received government funding to work on breaking a hole in the Space-Time Continuum during the Cold War. But a miscalculation caused Paradox to get sucked into the Event Horizon, where he remained displaced from time for 100,000 years. Losing his mind and regaining his sanity, he gained a complete understanding of the Space-Time Continuum and renamed himself Paradox. At some point in his career, Paradox separated and hid the pieces of the Map of Infinity, which could lead a person to the Forge of Creation.
In his first appearance in Alien Force, Paradox soon learns that the accident that gave him his power also sent an extra-dimensional creature fifty years from the time of the experiment. Meeting Ben as they confront the creature, Paradox learns the monster is actually Hugo and manages to negate the monster's existence by keeping his friend from getting sucked it. After returning to Ben's present, Paradox was shocked that he didn't figure it out first as he gives an older Hugo to a look at eternity.
In the Ultimate Alien episode "Ultimate Aggregor", Paradox informed the team that Aggregor was using his old time travel equipment to achieve his goals. He also gave Kevin advice concerning the future, telling him that things would get worse before they got better, and to try to remember who his friends were. He also warned Ben "not to lean against the chronal randomization barrier", but doubted that he would listen. In "The Forge of Creation", Paradox appears to help the team to go to the Forge of Creation which is outside the universe, but is unable to stay with them as he "is not allowed to go within 500 lightyears" of Celestialsapiens, per their treaty. Paradox later returns in "Ben 10,000 Returns", aiding Ben and his future self against Eon. Before taking his leave, Paradox leaves Ben with a cryptic warning concerning Sir George and Dagon.
Returning in Omniverse, wearing steampunk attire, Paradox is revealed to have been fighting a time war as he is pursued by Eon for the Chrono Navigator he possesses. But with Ben's help, Paradox protects the timeline though the restoration erased their meeting during that time. He would later join forces with 16-year old Ben and his future self Ben 10,000 on several other occasions to counter the threat of Eon and his benefactor, the rogue Chronosapien Maltruant. In the end, he and Ben succeeded in locking Maltruant in a time loop in which he is defeated, repaired by his minions, and then defeated again.
- Scott Menville - Ben 10: Ultimate Alien, Ben 10: Omniverse
James Jonah "Jimmy" Jones is a 10-year-old kid who lives with his mom(Mrs Jones) in Jones apparentment located in bellwood Jimmy is a major fan of Ben, and he found out Ben's secret and revealed it to everyone on the planet by creating a video that showed the world Ben's ability to turn into aliens, as he thought Ben would like the attention and money. Mrs Jones is Jimmy's mom she looks like her son with similar faces she has brown hair with pony tail golden earrings white sleeves blouse dark blue thight skinny jeans and white shoes she is usually shown strict to Jimmy and shouts at him mostly though she dealt sweetly and kindly with visitors like Gwen Ben Kevin throughout the series she is usually shown baking fresh cookies at home Jimmy runs a website with pictures of aliens around the world, including every alien Ben has ever turned into. He watches Ben by alerting him about any alien activity he finds via the internet. In "Andreas' Fault", Jimmy is revealed to have a secret informant in the Forever Knights in the form of Foreverduke838. Ben realizes that Jimmy is very useful for letting him do what he wants, even giving Ben "relationship advice" and helping on fights. In Ultimate enemy Jimmy and his mom made a cameo where they were suddenly transformed into a escoterica by diagons mind control wave along with every person o Earth she was later cured by ascalon when Ben used to turn every one back normal In Omniverse, he has more reddish-brown hair and a jacket in same design to Ben's jacket in Alien Force and Ultimate Alien. Later in the show, a character named "Chrono Spanner" is introduced, who had weaponry from the future and helped Ben and Rook. When they recruited Jimmy as a spy, they saw a series of coincidences when Jimmy would disappear and Spanner would appear, and Spanner would disappear and Jimmy would appear. Ben and Rook suspected Jimmy he was Spanner, but had no evidence to prove it
These aliens are from the Andromeda Galaxy that were kidnapped from their planets by an Osmosian named Aggregor, who wanted to absorb the powers of the five aliens he captured and obtain the "Ultimate Prize". All of them escaped from Aggregor's ship using a shuttle and crashlanded on the coast of Florida; afterwards, Galapagus, P'andor, Andreas, and Ra'ad each split up to find a way off the planet while Bivalvan stays with the shuttle and attempts to repair it, but all the aliens were later recaptured.
In "Ultimate Aggregor", after regaining all of the prisoners, Aggregor releases them but he takes control of their minds and has them attack Ben and his friends to gain more time for his plan be successful. When Aggregor used the machine to drain the aliens powers, they faded away.
In "Absolute Power", all the aliens that Aggregor killed and drained were brought back to life after Ben and the others stopped Kevin, releasing their powers.
- Dee Bradley Baker - Ben 10: Ultimate Alien
Bivalvan (a play on bivalve, a term for clams and oysters) is a crustacean-like creature and Water Hazard's genetic donor.
Every night he would rise out of the ocean and raid NASA, stealing equipment from their secret rocket project, and using the stolen items to repair the ship. Unfortunately if he had managed to launch the ship, the nuclear bomb he was going to ignite it with would have destroyed most of Florida. Ben, Gwen, Kevin, and Julie were able to stop Bivalvan from launching his ship, scanned his DNA, and promised that they would send Plumbers to get him and send him back to his home planet. However, Aggregor arrived before the Plumbers and recaptured Bivalvan.
- John DiMaggio - Ben 10: Ultimate Alien
Galapagus (a play on the Galápagos Islands, home to the Galápagos tortoise) is a turtle-like creature and Terraspin's genetic donor. Like the other members of his species, he is gentle, kind, and easily scared.
One day, Aggregor attacked his home planet, captured him, and imprisoned him with the other four aliens he had captured. When the five attempted to escape Aggregor's ship, Galapagus suggests using his communicator to send out a distress message. Even though he and the other aliens are put back into the cell, his message is heard by Magister Prior Ghilhil, who boards Aggregor's ship and finds the five aliens, only to be attacked by Aggregor. Bivalvan, P'andor, Andreas, and Ra'ad escape again, but Galapagus seemingly betrays them to Aggregor in exchange for his own freedom. When Aggregor admits he wasn't going to free him, Galapagus admits he didn't intend to betray the others either and incapacitates Aggregor. He then leads the escape to a shuttle, which Aggregor shoots down and causes to crash on Earth. Afterwards, each split up to find a way off the planet while Bivalvan stays with the shuttle and attempts to repair it.
Seeking help, Galapagus attacked Bellwood's downtown to get the attention of Ben. While battling, Gwen notices that he hadn't actually harmed anyone, and convinces Kevin to use the translator in his Plumber's badge to translate his words into English. After hearing his story of how he escaped Aggregor, Ben scanned samples of his DNA for the Ultimatrix, and has him taken back to his home planet in a Plumber spaceship. However, Galapagus finds out the spaceship's pilot is Aggregor in Magister Prior Gilhil's Plumber suit.
- Dee Bradley Baker - Ben 10: Ultimate Alien
P'andor (a play on Pandora) is a Prypiatosian-B trapped in a power-limiting armor who is NRG's genetic donor. Desperate to return to full strength, he ends up establishing a reward to whoever can break open the suit. When the hired help consisting of Buzz, Hammer, and Surgeon are unable to use the Taedenite to break it open, P'andor sends them to capture Kevin. Upon his hired help capturing Kevin, P'andor tricks him into releasing him from his containment suit. Revealed as a living energy being, P'andor attempts to drain the radiation out of a nuclear power plant, but Kevin and Ultimate Cannonbolt are able to trap him back in his suit and turn him over to the Plumbers who deport him back to his home planet. Unfortunately, their ship is intercepted by Aggregor who blasts the Plumbers out into space and recaptures P'andor.
- Dee Bradley Baker – Ben 10: Ultimate Alien
Andreas (a play on the San Andreas Fault) is a bulky, yellow, armored alien who is Armodrillo's genetic donor. He is reckless and oblivious, proven when he repeatedly attempted to wreck a spaceship while still inside it. His intelligence is quite low, and doesn't even know what an asteroid is. Andreas has shown him to be a gentle giant, getting easily scared, and thinks most people are his friends.
Sometime after he separated from the others, he met up with Argit, who became Andreas's "friend". Then he took command of the Forever Knights by threatening to use Andreas to destroy their castles. His plan backfires when the Forever Knights rebel and capture Andreas, Argit, Ben and his friends. Andreas is to be executed but Ben and his friends save him and he then considers them friends. When the Forever Knights set a weapon to self-destruct, Andreas decides to save his friends by absorbing the blast on Argit's suggestion. Andreas saves them and was assumed dead by everyone. Miraculously, Andreas survived but was greatly injured, which made it easy for Agreggor to arrive and capture him once more.
- Dee Bradley Baker – Ben 10: Ultimate Alien
Ra'ad (from Ra'ad, the Arabic male given name for thunder) is an Amperi and AmpFibian's genetic donor. He prefers to be quiet and observant, questioning Galapagus's trust briefly and agreeing that Bivalvan's plan was the best. He also appeared somewhat controlling, having a short argument with P'andor over power but quickly changed his mind and went along with Bivalvan.
After learning that Aggregor had captured the others, Ra'ad attacked Ben and blamed him, thinking he had given the others aliens to Aggregor. Ben defeated and captured him, but Ra'ad duped them into letting him go, under the pretense of friendship. Ra'ad then entered the Ultimatrix forcing Ben to change into his form, and slowly taking control of his mind, but while he was undercover, he kept the Ultimatrix off-line, so Aggregor couldn't track him. Kevin was able to force the Ultimatrix to reboot, knocking Ra'ad out of it. Sensing Aggregor's approach, he fled, leaving Ben and company to fight him. However, after being scolded about his cowardice by Kevin, he returned, saving Ben from Aggregor's attack, but in doing so he ended up getting recaptured by Aggregor.
- Peter Renaday - Ben 10: Ultimate Alien
Sir George is the First Knight blessed with immortality at his birth, having founded the Forever Knights over a thousand years ago. For reasons unknown, George left the order and has been in hiding for centuries. He has a coin with the infinity symbol, the same symbol as the seal that held the Lucubra.
George was born as Georgius in Ancient Rome in 231 AD. He acquired immortality at some point by unknown means, living for over 900 years before becoming a knight in the medieval era. Sir George forged the seal that kept the Lucubra in the 4th century, and in 1131 he also defeated another extra-dimensional creature known as Diagon with the sword Ascalon, created and given to him by Azmuth. George carved out Diagon's heart and pinning it to the ground with the sword, becoming the basis for the legend of Saint George and the Dragon.
In the 1930s, he moved to the Bellwood Senior Village and lived there for over 70 years and where he first appeared in "The Creature From Beyond". He had a coin with the same symbol as the seal that held the Lucubra. He somehow knew when the seal was destroyed and left. At the end of the episode he was seen looking at the damaged seal, and then leaving. In "Prisoner Number 775 is Missing", Sir George arrives at Area 51, where he attacks the guards and removes the base, turning it into a new Forever Knights stronghold.
In "The Purge", Sir George appears during a meeting between Enoch, Driscoll, Patrick and Urian. After a brief fight with Driscoll, he is identified as the founder of the Forever Knights and unites the factions into one. Sir George's first order was the Forever Knights target the aliens living on Earth and remove them whatever way possible. He later sends Driscoll to lead the Forever Knight soldiers into attacking an alien air-lift area that Ben was guarding. Upon learning of Driscoll's defeat, Sir George is not disappointed as it was just a distraction for a bigger plan. Sir George has Driscoll lead the Forever Knights while he is away and to have the Forever Knights ready upon his return, "for the battle of 100 lifetimes". Sir George has been on a quest for several days since it to find Ascalon and Diagon's heart so that he might destroy the heart. Using a long series of calculations, Sir George found when and where the shrine that holds the sword and heart would appear next. Through the Flame Keepers' Circle and Vilgax hindered his quest, George reclaimed Ascalon and was restored to his youthful self as he prepares the Forever Knights for a confrontation against Diagon while promising to give Ben the sword should he fail to stop the menace.
In "Beginning of the End" and "The Ultimate Enemy", when the Flame Keepers' Circle make their move, George goes to Diagon's cave and he finds Vilgax breaking the seal before battling him after killing Conduit Edwards. But once Vilgax freed Diagon, George is killed by him and Ascalon goes to Ben's possession where he finished what he started. In the end, Ascalon returned to Azmuth alongside the Ultimatrix.
Alternate Versions of Ben Tennyson
- Tara Strong - Ben 10: Omniverse
Ben 23 is a rich and younger version of Ben from Dimension 23, being a celebrity in his universe with his own agent. In contrast to Ben, Ben 23's coloration is blue and gold, and he gives his aliens different names than Ben. Making his debut in "Store 23" when Ben ended up in Dimension 23, Ben 23 is revealed to only got the Omnitrix after his universe's version of Max Tennyson died. As a result, Ben 23 taught himself how to use the Omnitrix while on the notion that all aliens are evil as he fought a group of aliens serving the Intellectuary: Dimension 23's version of Azmuth who deemed the boy unworthy due to his misuse. But Ben's interference allows Ben 23 to understand that not all aliens are evil. Ben 23 returns in the "And Then There Were None"/"And Then There Was Ben" two-parter when recruited in the fight against Vilgax and Eon, and then in the "It's a Mad, Mad, Mad Ben World" two-part episode to be mentored by Ben as they end up in Mad Ben's universe.
Ben 23's Omnitrix Aliens
Ben 23's aliens are a blue version instead of green. His Omnitrix is a blue and gold variant. But Ben 23's aliens have the same powers as Ben 10's; they only have different names.
- Freezelizard - Arcticguana - Voiced by: Eric Bauza
- Rollaway - Cannonbolt - Voiced by: David Kaye
- Electricyeti - Shocksquatch - Voiced by: David Kaye
- Build-A-Guy - Bloxx
- Eye Guy - Eye Guy - Voiced by: Paul Eiding
- Big Bug - Stinkfly - Voiced by: Dee Bradley Baker
- Vomit Man - Upchuck - Voiced by: Eric Bauza
- Speedyquick - XLR8 - Voiced by: Yuri Lowenthal
- Toolboxx - Armodrillo - Voiced by: John DiMaggio
- Nighty Knight - Pesky Dust - Voiced by: Tara Strong
- Mr. Monkey - Spidermonkey - Voiced by: Dee Bradley Baker
- Techno-Bubble - Upgrade - Voiced by: Tara Strong
- Dino-Mighty - Humungousaur - Voiced by: John DiMaggio
- Freezeghost - Big Chill - Voiced by: Dee Bradley Baker
- Handy Man - Four Arms - Voiced by: John DiMaggio
- Lightning Volt - Frankenstrike - Voiced by: David Kaye
- Brainfrog - Grey Matter - Voiced by: Eric Bauza
- teeny weeny - Nano Mech - Voiced by: Alex Winter
The adult version of Ben from a moment in Earth's future where humans and aliens live in co-existence. While a world-renowned hero with 10,000 different alien forms, his powers solely depend on the Cross Time variations. In the original series, Ben 10,000 became all business and just can't relax, not even for his own family until meeting his past self helped him remember what is more important. As revealed in "Ken 10", Ben 10,000 was married to Kai Green and they have one child: Kenny, who gained his own Omnitrix which retains his aliens when he was young.
In Ultimate Alien, in an alternate future where Ben kept the Ultimatrix, Ben 10,000 used the Ultimate Alien option to lock himself as an "Ultimate human" who access the abilities of his alien forms. He appears in "Ben 10,000 Returns", where Ben 10,000 seeks his past's self-help in fighting off Eon after being visited by Professor Paradox.
In Omniverse, the Ben 10,000 from the Original Series returns in "Ben Again" where he came to present Ben's time period looking for Professor Paradox. He is able to create combinations of his alien forms such as Fourmungosaur and Atomic X. He appears in the "And Then There Were None"/"And There Was Ben" two-parter among the various versions of Ben to fight Vilgax, Eon, and their army of alternate evil Bens.
- Sean Donnellan - Ben 10: Ultimate Alien
Ultimate Ben is the ultimate form of Ben 10,000, who can use the abilities of his aliens without turning into them. A large green hologram of the alien he chooses appears whenever he accesses their powers.
Kenny Tennyson/Chrono Spanner
Kenny Tennyson is the son of Ben and Kai Green from the future. Kenny first appears in Ken 10 when he receives his own Omnitrix in a timeline where Kevin never became an ally of Ben's and befriended Kevin's son Devlin Levin. In Omniverse, gaining time travel technology from Paradox, Kenny assumed the identity of a time traveler named Chrono Spanner and aids his father's younger self in moments that require his involvement while taking certain items with him without fear of changing history. Initially believed to be Jimmy Jones at first because neither appear at the same time before the events of Fight at the Museum, Kenny got involved in his parents' love life while helping them protect the Orb that he later took to give to his mother in secret. Eventually, Kenny's identity as Chrono Spanner is revealed in the Omniverse series finale where he brings Ben and Rook to his time to face Maltruant.
Kai Tennyson (Future)
- Bettina Bush - Ben 10: Omniverse
The future version of Kai Green who married Ben and became Kenny Tennyson's mother. While absent in the original series, she was mentioned to be on a diplomacy mission in Vilgaxia during the events of "Ken 10". Kai makes her official debut in the Omniverse episode "Fight at the Museum" where she found the Orb that Kenny secretly brought to their time period. During the series finale, she helped Ben defeat Dr. Animo and then confront Maltruant before he escaped into the past.
While technically her universe's version of Ben, she is an alternate version of Gwen who found the Omnitrix instead of her cousin. Other than that, her adventures mirror Ben's up to her capture by Vilgax where she lost the Omnitrix during the fight with Grandpa Max ending up with it. In the "And Then There Were None"/"And Then There Was Ben" two parter, Gwen was recruited in the fight against Vilgax and Eon just after gaining the Omnitrix.
- Patrick Cox - Ben 10: Alien Swarm
Big Ed is a human who appeared in Ben 10: Alien Swarm; he is in charge of the car workshop Kevin works at in his spare time.
Cash and JT
Cash is voiced by:
- Dee Bradley Baker – Ben 10
- Matt Levin – Ben 10: Alien Force and Ben 10: Ultimate Alien
- Roger Craig Smith – Ben 10 (Reboot)
- Tyler Patrick Jones – Ben 10: Race Against Time
JT is voiced by:
- Adam Wylie – Ben 10
- Yuri Lowenthal – Ben 10: Alien Force (In "Ben 10 Returns" Pt. 1)
- Scott Menville – Ben 10: Alien Force (In "The Gauntlet") and Ben 10: Ultimate Alien
- Max Mittelman – Ben 10 (Reboot)
- Tyler Foden – Ben 10: Race Against Time
Cash Murray and JT are Ben's former bullies from school. Cash is taller and has darker skin, JT is shorter and wears glasses. JT and Ben were best friends in the first grade before Cash moved to Bellwood. They are modeled after series producers Sam Register and Tramm Wigzell.
In Ben 10: Alien Force, Cash and JT found an alien tech gauntlet in Kevin's car that shot lasers. While taking turns using the Gauntlet, Cash became addicted to the weapon's power, and attacked JT when he tried to take it from him. After beating Kevin and declaring himself the "coolest guy in the neighborhood" Cash challenged Ben to a one-on-one battle. With JT's support, Cash realized that the armor was controlling him, and broke free of its power. Since then Cash and JT have been more friendly towards Ben, and are among the first to show their support when Ben's identity as a "hero" is exposed to the public.
In the Ultimate Alien pilot episode "Fame", Cash and JT applaud Ben at school after his secret has been exposed. In "Reflected Glory", they try to take credit for Ben's plans, and use Oliver Thompson to help them to make a TV show in which they claim to be the brains behind Ben 10. Psyphon, on a mission to gain the "Power Decouplers" for the Forever Knights, goes after JT and Cash since they claim to be the brains behind Ben 10 and are therefore responsible for the defeat of Vilgax, Psyphon's master. In order to save themselves, JT and Cash are forced to admit they were lying about everything causing Psyphon to turn his attention to Ben only. At the end, Ben was being killed by Psyphon, so they use the Power Decouplers to shoot Psyphon, taking him out and saving Ben's life, however, the shot breaks Oliver's camera, destroying everything they recorded, including the scene where they save Ben. With no footage and its stars discredited, Oliver subsequently cancels the show. In "The Ultimate Enemy", they were transformed into Esoterica off screen by Diagon's mind control wave but later cured at the end of the episode when Ben used Ascalon to cure them and rest of world.
Lt. Steel is the leader of SECT, a government task force that deals with alien activity on Earth. He initially regards Ben and all aliens as a menace due to the actions of Kevin, who was posing as the Omnitrix aliens at the time, committing across the country. However, after Ben saved his life on top of Golden Gate Bridge, he returns the favor by clearing the boy's name. He later briefly reappears in Omniverse where he and the rest of SECT are attacked by both past and future Animos, requiring Ben to rescue them as Gutrot.
Tetrax Shard is a Petrosapien (Diamondhead's species) mercenary, and the first alien species of the Omnitrix that Ben had met.
Tetrax was originally a selfish bounty hunter until he accepted the job to steal his people's sacred crystal and deliver it to Vilgax. After the galactic warlord used it to destroy his home world Petropia, Tetrax felt guilty, and became concerned about who he worked for, and started trying to be sure Vilgax would not get other weapons of mass destruction (such as the Omnitrix).
Under the alias of Hoverboard in his first appearance for his namesake flying device, Tetrax was hired by Vilgax with Kraab and Sixsix to take the Omnitrix from Ben. However, it's soon revealed he's actually working for another unnamed force that wants him to assure Vilgax doesn't get the Omnitrix. When he initially meets Ben, he criticizes his lack of strategy, and tries to take Ben with him in order to deliver the Omnitrix to his true hirer. When Kraab and Sixsix then choose to team up against Tetrax, Ben is able to use strategy to defeat the two of them, causing the Petrosapien to agree to let him stay on Earth, since the Omnitrix is in good hands.
Tetrax comes back in "Ben 10: Secret of the Omnitrix”, where he helps Ben and Gwen travel in space to find Azmuth so he can disable the Omnitrix's self-destruct mode.
Tetrax also plays a role in "Ben 10: Destroy All Aliens", where he comes to Earth to find Ben after picking up a signal from the Omnitrix. He locks Ben from transforming back into human for his own good, and is also sucked into the Omnitrix.
In Alien Force, Tetrax discovers the Petrosapien Crystal was actually a backup for his planet and his people, containing all their memories and DNA. Learning this, he stole it from Vilgax and freed Sugilite (Chromastone's genetic donor) from the Omnitrix, so he could use the crystal to bring back Petropia. Despite Vilgax almost killing Sugilite, the planet is brought back thanks to Ben.
In the reboot, Tetrax first appears in "Omni-Tricked" to prevent Vilgax's restoration alongside Sixsix and Kraab. He then returns in "Bounty Ball" where he and his group were hired by a mysterious employer who offered them a fortune to retrieve the Omnitrix, only to fail while being unmasked and warning Ben that others will come for him.
Xylene is an Uxorite plumette and old friend of Max, who sent the Omnitrix to Earth at the beginning of the original series.
In "The Visitor", she awoke from the cold and attacks Ben and Gwen asking for the Omnitrix but is stopped by Max and recognize each other and told him that she was sending it to him but Ben found it.
The Galactic Enforcers
The Galactic Enforcers are a group of alien "super heroes" that Ben first encountered in their titular episode. Ben was part of the team only in that episode; he was only recruited because he had the Omnitrix. Ben resigned after realizing that he would be better without them.
In the episode "Ben 10,000", set 20 years into the future, Ben's otherwise perfect patrol route left them out of a job and they were forced to clean up after Ben, bringing the criminals he captured to the authorities. Near the end of the episode, Ben lets them deal with the Circus Freaks while he attends Grandpa Max's birthday party.
They appear briefly in the beginning of the third-season episode "The Vengeance of Vilgax". Vilgax was attacking their home-planet T-K, and challenged Ultimos to a duel but Tini and Synaptak apparently interfered with the duel causing Vilgax to attack the two and then defeat Ultimos. Vilgax then drained his powers with the help of Psyphon and then claimed their planet as part of his empire.
Ultimos is a Specimen Prime from the planet T-K and leader of the trio and he obeys the Galactic Code of Conduct a lot, without hesitation.
He has Superman-like powers, look and attitude and it is shown that he has a dangerous reaction to chocolate. Upon arriving on Earth, with Ben's help, he and his team capture Sixsix and Vulkanus but the two escaped due to an argument between Ben and Ultimos on how to bring the villains in but he still made Ben an honorary associate. Despite his by-the-book personality, he's shown to like Ben's approach to fighting, stating that it makes him feel free.
In "The Vengeance of Vilgax", Ultimos has his powers drained by Vilgax and Psyphon after he was defeated. It wasn't mentioned what happened to him after that.
- Greg Ellis – Ben 10 and Ben 10: Alien Force
Synaptak is a floating telekinetic brain in a jar with a computerized face and tentacles and he is the second in command of the group.
Synaptak had the abilitiy to levitate and has psychic powers of telepathy, telekinesis, and can project mind blasts and force fields from his brain. Effectively the brain of the group, he's shown to have an enormous crush on fellow member Tini, showing great jealousy over Tini's crush on Ben, which Ben easily took advantage of, saving both his new teammates and his family from a rock slide.
In "The Vengeance of Vilgax" Pt. 1, Synaptak and Tini are defeated by Vilgax before his fight with Ultimos.
Tini is a female Tetramand and easily the strongest of the team, complete with all of Fourarms's powers but with better control over them. Upon arriving on Earth, she met Ben as Fourarms and developed a crush on him and throughout the episode, tried to encourage him to turn back into Fourarms, much to Ben's dismay. She was not aware of Synaptak's crush on her until Ben manipulated him into using his telekinetic powers to hold back a landslide, and at the end of the episode the two started dating.
In "The Vengeance of Vilgax" Pt. 1, Synaptak and Tini are defeated by Vilgax before his fight with Ultimos.
Myaxx is a female Chimera Sui Genris and Azmuth's assistant, where she helped him in the creation of the Omnitrix, collecting several DNA samples for the Codon Stream. However, since Azmuth didn't give her the credit she deserved, she left a genetic signature in the Omnitrix overwriting his, and walked away. Despite being a good fighter as well as the same species as one of the most dangerous warlords in the universe, she's quite a coward who doesn't like fighting and would rather try to walk away or escape if she has the chance.
In "Secret of the Omnitrix", Ben, Gwen and Tetrax finds her in the Prison Satellite Incarceron. Ben confuses her with Vilgax and attacks. After the confusion is cleared, Myaxx tells the group that she's the creator of the Omnitrix so they can get her out of prison, but is forced to tell them the truth once they escaped. She still agrees to show them where Azmuth is, as well as putting a device on the Omnitrix to reflect the Omnitrix's energy blasts back inside it. When Vilgax comes to the planet Xenon (where Azmuth is), Myaxx helps Tetrax and Ben, despite her cowardice, fight Vilgax's minions. After Ben defeats Vilgax, Azmuth offers for her to be his assistant again. Though he admits he won't be able to treat her better than before, she agrees, preferring to be his assistant rather than go back to Incarceron.
Myaxx appears at the beginning of "The Final Battle: Part 1" warning Azmuth that Albedo stole the Ultimatrix. Her look is completely changed, giving her a more feminine appearance, red armor and pink eyes.
Carl & Sandra Tennyson
Carl is portrayed/voiced by:
- Dee Bradley Baker - Ben 10, Ben 10: Destroy All Aliens
- Don McManus - Ben 10: Alien Force, Ben 10: Race Against Time
- Yuri Lowenthal - Ben 10: Ultimate Alien
Sandra is portrayed/voiced by:
- Tara Strong - Ben 10, Ben 10: Destroy All Aliens
- Vyvan Pham - Ben 10: Alien Force (In "Ben 10 Returns Pt. 1" (where Sandra gets angry and yelling at Ben when he ran upstairs)
- Beth Littleford - Ben 10: Alien Force (In "Grounded") and Ben 10: Ultimate Alien, Ben 10: Omniverse, Ben 10: Race Against Time
Carl Tennyson & Sandra Tennyson are Ben's parents and Gwen's uncle and aunt. Carl is Max and Verdona's son and Frank's brother, and Sandra is Max and Verdona's daughter-in-law. In the live action film Ben 10: Race Against Time, Carl is depicted as a new-age style parent who wants Ben to have his "freedom," insisting on being called Carl, not dad, and Sandra insisting on being called Sandra, not mom, and letting Ben run off on mysterious adventures without asking questions. He seems to be even more laid back than his wife, and is seen at least twice telling her to let Ben have his fun. Sandra is strict. Throughout series Sandra seems to have a liking for health and fitness as she has been seen exercising with a fitness ball and also has rejected offers of cotton candy, stating that "processed sugar is poison". Ben tries especially hard to avoid eating her "healthy" cooking. Sandra's physical appearance is that she mostly has fair skin, green eyes and blonde hair. But in Ben 10 Returns, her hair colour was brunette instead of blonde but throughout the series it is blonde, which was later revealed to be an error. In Destroy All Aliens she wore a purple sweater over a lavender shirt, white pants and purple Mary Jane's flats. In Ben 10 Returns: Part 1, she wore a white shirt, a blue apron and yellow gloves while washing dishes. In Grounded and Hit 'em Where They Live she wore a red sweater, black pants and Black flats and in Omniverse she had , silver earrings, and a golden necklace. She wore a light green sweater, white tan Capri pants above knee length and below ankle length and wore white flats. Sandra and Carl made their first chronological appearance in Destroy All Aliens where she and Carl ground Ben for a mishap in the school he attended where the Omnitrix accidentally teleports his homework and forced Ben to stay home to complete a history report. Later on, she and mainly Carl inform Max and Gwen that Ben has escaped the house. Then, Ben as Grey Matter enters into their house where Sandra and Carl find him. Sandra begins attacking him, but Grey Matter jumps on her head and she throws him outside. Grey Matter then transforms into Diamondhead and Sandra passes out and Max knocks Carl out. When Ben tries to transform, the Omnitrix malfunctions and transforms Sandra into Heatblast and Carl into Wildmutt. Eventually, Gwen and Ben use the Omnitrix to transform him and Sandra back into normal and they, having forgotten that they grounded Ben, allow for Ben to go on a fishing trip with Grandpa Max and Gwen. In Ben 10 Returns: Part 1, Sandra made a brief cameo where she was washing dishes and angrily warned Ben for not running in her house to which Ben apologized to her They appear in the Alien Force episode "Grounded", when they ground Ben after finding out that he has been using the Omnitrix without permission or informing him and his wife. Later, they help Ben defeat a Highbreed and allow him to keep his Omnitrix upon realizing that Ben is the only one who can save the world from the Highbreed.
In the Ultimate Alien episode, "Hit Em Where They Live," Carl is oblivious to the fact that Vulkanus, Charmcaster, and Zombozo were a few feet away and about to attack him and that Ben, Gwen, and Kevin were battling them while he was putting a spare tire on his car. Sandra was kidnapped by Zombozo, but is later rescued by Gwen. In "The Ultimate Enemy", both Sandra and Carl Tennyson are transformed into Esoterica by Diagon's mind control wave off screen along with every being on earth. They were possibly the ones to attack Kevin and Gwen when they arrived on Bellwood to find a book which may contain spell of diagon and at the end of episode she along with Carl are cured and are transformed back into humans by Ascalon. In Omniverse Sandraa reappeared in Rules of Engagement, where Princess Looma meets her.
She later appeared in O Mother, Where Art Thou?, and convinced Ma Vreedle not to destroy Earth. She also cooked healthy food to Ben and Rook, following them around for most of the episode with Ben's leftovers.
In Vreedlemania, she brought Ben and Rook along to a dinner with Ma Vreedle and her family, having become friends with the criminal matriarch. When the reunited Vreedles cause trouble in Bellwood, Sandra manages to talk Ma Vreedle into stopping, and later comforts her when Pa Vreedle runs out on her. In The Most Dangerous Game Show, Sandra briefly appears as one of the contestants chosen by Charles Zenith to compete for Ben's hand in marriage, but is removed from the game when Ben points out their relation
- Rob Paulsen - Ben 10: Alien Force and Ben 10: Ultimate Alien
Baz-El is a Galvanic Mechomorph whose name wasn't revealed until "Vreedle Vreedle".
Baz-El is a pilot who crashed and spawned Ship to find someone who could help him; he wanted help from Ben because he thought he was a Plumber, and before he left, he allowed Ship to stay with Ben and Julie. In "Vreedle, Vreedle" where he hired the Vreedle Brothers to retrieve Ship, without knowing of their incompetence, he appeared in the court where he lost the trial on who kept Ship.
Baz-El returned in the Ultimate Alien episode "Eye of the Beholder" where he was stealing crystals from the ruins of a planet inhabited by the Churls and been caught by the Stone Guardians. However he reveals that he has a job scanning the atmosphere of various planets and makes money on the side by stealing artifacts from the planets he scans as part of his "retirement plan." This is how he earned the scorn of the Churls. When Ship felt him being in danger, and attempted to go and save him, Ben, Julie, Gwen and Kevin followed. After Baz-El was saved, Julie, believing Ship was better with him, attempted to give him back to him, but Baz-El insincerely stated he was going to sell Ship as a weapon causing the minute Mechomorph to choose to stay with Julie.
- Barbara Bain - Ben 10: Alien Force (Elderly human form)
- Juliet Landau - Ben 10: Alien Force and Ben 10: Ultimate Alien (Anodite form and teenaged human form in "Moonstruck")
Verdona Tennyson is Max Tennyson's wife, mother of Carl and Frank Tennyson, and paternal grandmother of Ben and Gwen. She is an Anodite who Gwen inherited the ability to control and manipulation of mana, the substance of magic and life itself. Like all Anodites, Verdona is a free-spirited being. Though sometimes acting more mature and grown-up, she mostly acts like a playful child. There is also another side of Verdona which is somewhat amoral and uncaring, for example when she almost destroyed Ben and Kevin when they first confronted her, only being stopped by the intervention of Gwen and learning who they really were. Likewise she was also willing to destroy her granddaughter's physical human body to release the Anodite lying dormant deep within her.
Verdona and Max had met in the beginning of the 1960s, during John F. Kennedy's presidency. Verdona left Anodyne in an unspecified time and was brought to Earth by a robot alien called Synthroid, who had captured her and wanted to use her to power his world. They crashed and landed in St. Louis where she met and fell deeply in love with Max after he saved her; they then courted each other and married. During this time she hid her Anodite heritage very well and blended in with society. During their time together, Verdona hid from Max that she knew about his occupation as a Plumber, prompting Max to always lie to her every time he left. Eventually after a long, happy and yet somewhat distant relationship, they parted.
They had two sons together, Carl and Frank, though neither of them showed any signs of inheriting Verdona's incredible abilities. When they were grown up and out of the house, she returned to Anodyne; after so many years on Earth, Verdona wanted to get back in touch with her background. She came back to Earth once to see if any of her grandchildren had inherited any Anodite abilities and powers from her, but saw that none did. Only several years later, she found out that Gwen, her granddaughter had developed powers and abilities of her own. It should be noted that Big Chill is in fact Ben, which makes Big Chill's offspring Verdona's great-grandchildren.
Verdona apparently favors Gwen over Ben; due to the fact that he did not inherit any powers from her. This led her to put him to one side in her focus and/or ignore him as shown when she magically conjured tape on his mouth so that he could not speak. However, after their final fight against each other did Verdona saw just how much Ben cares about Gwen, leading the two to reconcile and part on good terms afterwards. She also has an uncanny sense of humor that was passed on to Ben. Arguably, Ben inherited his grandmother Verdona's spirit, sense of humor and overconfidence, while also inheriting his grandfather Max's determination, adventurous, bravery, and self-sacrificing attitude. Verdona has been shown to be a strict disciplinarian and to be serious when she needs to be.
Verdona appears for the first time in "What Are Little Girls Made of?" when she explained everything to Gwen about her alien inheritance. She offered Gwen the chance to come back with her to Anodyne to reach the full potential of her powers and abilities, but Gwen had refused the offer. Verdona then shed her human body, revealing her true Anodite form. Thinking that Gwen was too young to make her own decisions, decided to destroy Gwen's human body to free the Anodite lying dormant inside. Ben and Kevin then stepped in to defend Gwen and, after the brief battle, Gwen explained to Verdona that she would rather stay on Earth with her friends and family. Verdona then tells Gwen that she wished that Max had been an energy being like them, expressing her deep longing for him, hinting that her desire to take Gwen with her could be just a front to fill the void in her heart. Verdona then promised to return every so often to see how Gwen was doing.
One year later, Verdona eventually returned in "Girl Trouble", where she was able to overpower Sunny. She then took Sunny and her boyfriend Antonio back to their home planets and allowed their parents to deal with them. Again, she was disconcerted when Gwen refused her offer to come with her to Anodyne.
The truth of how Verdona arrived on Earth and fell in love with her human husband is revealed in Moonstruck in the form of memories belonging to Max Tennyson. As a young Anodite, Verdona was taken from her world by a sentient and autonomous robot (known as a Synthroid), who intended to use her like a battery-due to her being made entirely of pure energy-and forcing her to fully energize the world of the Synthroids' for many years until it drained her dry. Fortunately, for Verdona, the spaceship was shot down by a seventeen-year-old Max, which allowed Verdona to escape but not before the Synthroid attached a metal bracelet on her wrist that turned into a humanoid teenager and rendered most of her abilities useless; except telepathy. Meeting Max in a diner, Verdona told the young man that he was the only one who could help her. The two then began to grow close and develop romantic affections for each other. after escaping another attack by the Synthroid, Verdona told Max who she was truly from and why the robot was after her. Max tried to break the bracelet neutralizing most of her powers, but failed. The Synthroid then knocked her unconscious and took Verdona to his ship. Using the strong telepathic link they now shared, Max came to save her. With the help of Magister Labrid, Verdona regained her Anodite form and full powers. She offered to take Max with her to show him the endless wonders of outer space. Knowing that she could not persuade him, Verdona expressed her romantic feeling for him in the form of a passionate kiss before flying off, promising to meet again.
Frank Tennyson is Gwen Tennyson's father husband of nateile Tennyson, the brother of Carl, uncle of Ben, and son of Max and Verdona. His occupation is mostly a lawyer He only appears in "What Are Little Girls Made Of?". In "The Ultimate Enemy", he was transformed into a Esoterica by Diagon's mind control wave off screen along with every person on earth but was cured by Ben at the end of the episode by Ascalon when Ben transformed everyone back into humans.
- Juliet Landau - Ben 10: Alien Force and Ben 10: Ultimate Alien
Natalie Tennyson is Gwen's mother, Ben's aunt, and the wife of Frank Tennyson (Carl's brother). Her occupation is mostly a house wife and does her job in arranging the house. She bears a similar resemblance to her daughter Gwen as They both have red hair, similar face, and physique.
Natalie has dark blue eyes, black eyebrows, thick eyelashes, and bags under her eyes.
She has her mid-length hair combed back.
She wears a white blouse with a green vest and a dark black mid flared skirt above knee length with black high-heeled shoes
She has golden earrings and a necklace with a golden buckle. . She appears first time in "What are Little Girls Made Of" when Verdona comes to Earth to visit Gwen and Frank. She has shown to be displeased with the heritage of Verdona.
Lili doesn't seem to be particularly too fond of the Tennyson family, as she is usually complaining about them by saying they're not as "formal" as her side of the family, possibly due to the fact that some of them are not completely human. She also said that Ben has bad table manners while castigated her father-in-law's fashion sense. She was also seen to have disagreements with her mother-in-law Verdona, making piericing stares at each other at every given opportunity. This animosity between the two is yet to be explained.
She appears later in the Ultimate Alien episode "Girl Trouble" where her niece Sunny stays with them for a while despite Gwen's objections. She later reappears in "It's Not Easy Being Gwen," where she has Gwen help out with writing and mailing out letters to her side of the family for a regal-like party. She shows in this episode that she is as fond of Ben and Grandpa Max as Verdona, noting that Max's food is inedible and Ben doesn't have the best table manners. In The Eggman Cometh, she is first shown in her kitchen when is preparing chocolate chip cookies in the kitchen when she is interrupted by Gwen, who tells her she is off to Kevin's house and has to borrow her car. After Gwen leaves, Natalie continues cooking when the egg which she has taken out from a box in the fridge begins to crack open and she calls in Ben and the others to investigate after a winged reptile damaged her kitchen. She shows disapproval when Ben transforms into Clockwork, reminding him that he had promised not to do that in her home. In "The Ultimate Enemy", she was transformed into Esoterica off screen by Diagon's mind control wave along with every being on earth. She possibly attacked Kevin and Gwen when they arrived to her house to find any book which contained spells of Diagon but at the end of the episode she was cured along with all humans when Ben used Ascalon to transform everyone back to humans.
- Richard McGonagle – Ben 10: Alien Force
Reinrassic III is a Highbreed, the seventh son of the Noble Highbreed House of Derazza, direct descendant of the Pure Blooded High Order of Rarsect.
He was first introduced in "Alone Together", where Ben was forced to work with him while trapped on the desert planet Turrawuste; though they needed each other to survive, Reiny showed the typical Highbreed hatred of who they wrongly call "lesser species". Reiny eventually lost his hand saving Ben from a Rodilla Dentia, but Ben used Swampfire to reattach it back, much to the Highbreed's surprise. Eventually they made it to the teleporter, but due to him forming a friendship with Ben,banishes himself to Turrawuste, believing himself tainted by him.
He returns in "War of the Worlds", after Ben healed the genetic damage in all Highbreed by fusing them with alien DNA. Reinrassic was unaffected by this because of his healing from Swampfire, as the vine used to reattach his arm has now spread up to his elbow and changed his DNA as well. He, despite his self-imposed exile, realized that the Highbreed's views on other species were wrong and that being fused with another alien's DNA wasn't a curse, but rather allowed them to survive. This caused the Highbreed Council to elect him as the new Highbreed Supreme, the leader of all Highbreed. He then called off the invasion and showed Ben respect.
In "If All Else Fails", Reinrassic aided Ben to stop a Highbreed Failsafe weapon left over from the war, which had been activated by a Highbreed Officer who was unaware the war was over. He told the officer that he is now the Highbreed Supreme, showing the Imperial Seal. He ordered the officer to shut the weapon down, but the officer revealed once it was activated it cannot be stopped. However Ben and Gwen came up with a plan to enter the weapon and deactivate it from the inside and managed to stop it. The Highbreed Officer took control of it, sacrificing himself to prevent it from destroying a nuclear power plant.
- Alyssa Diaz - Ben 10: Alien Swarm
- Tia Texada - Ben 10: Ultimate Alien and Ben 10: Omniverse
Elena Validus is the daughter of an ex-Plumber who appeared and had a large role in the live-action film Ben 10: Alien Swarm. According to the movie, she hung out with Ben and Gwen. During this time she and Ben became close, he helped her join the school soccer team, speaking up for her when the other players wouldn't let her join and eventually became the team's MVP. She was Ben's first major crush, but she was forced to leave Bellwood after her father Victor Validus was caught stealing alien tech from the Plumbers. She eventually discovers her father had been taken over by the Hive Queen and seeks help from Ben and the Plumbers. As Nanomech, he goes into her dad and he kills the Queen, who controlled the Nanochips. Elena's father was freed, but apparently died shortly after the events of the movie.
Elena returns in the Ultimate Alien episode "Revenge of the Swarm", where she is shown studying the remaining Nanochips. After meeting with Ben to discuss a strange series of events involving Nanochips, Elena begins to display a disturbing attraction to him, which eventually leads to her kidnapping Julie in an attempt to ruin her relationship with Ben. When Ben finds Julie bound and gagged inside one of Elena's locked rooms, Elena goes berserk and reveals that the Nanochips she had been studying had taken over her body. After nearly killing Ben, Elena eventually regains control of her body long enough to seemingly commit suicide by walking directly into a Nanochip-destroying force-shield that she had developed. Though Julie attempts to comfort Ben by telling him that the real Elena had likely died a long time ago, Ben tells her that he thinks that a part of Elena must have survived long enough to save his life. However, some nanochips start to reactivate themselves after Ben left. Later in "The Perfect Girlfriend", Elena was revealed to be alive despite her sacrifice but returns to her villainous ways when she disguises herself as Julie. In her Julie form, Elena tried to do everything possible to make Ben happy. She also injured Gwen's ankle by pushing her down an elevator shaft and attacked Kevin with a duo of building-monsters while he was spying on her but Ben defeated it. Once Ben finds out that Julie is actually Elena, he fights her but loses after she chokes him with nanochips. Julie tells Elena that if she kills him, then no one can have him. At the end of the episode, Elena retreats "knowing what hate feels like" and promises to return.
Unlike other Plumber's Kids, Elena is completely human, and has no known special powers (at least in her first appearance). However, she is a capable fighter and exceptional martial arts (skilled in both armed and unarmed combat). According to Ben she is also great athlete, becoming their school soccer team's "Most Valuable Player". A Galvan Plumber instructor also mentioned she was one of his best students, and might have become a great Plumber. While possessed by the Queen, she displayed the ability to transform into a Nanomech/Human Hybrid, with the powers to control the Chips and shape them into whatever shape she pleased.
- Herbert Siguenza - Ben 10: Alien Swarm
- Brian George - Ben 10: Ultimate Alien
Victor Emilio Validus is the father of Elena and an ex-Plumber. He is the former pupil of Max, who planned on passing command of the Plumbers to Validus and retires. However, he was discovered stealing alien technology (a serious violation of Plumber regulations). Feeling deeply betrayed by Validus, Max did not believe him when he explained that the alien technology he stole was in reality an alien species known as the Hive.
Prior to the movie, Validus was studying the chips to find a weakness. During his studies he became host to the Queen of the hive, using his plumber knowledge the queen upgraded the chips and later used his body to mass-produce the chips
Victor reappears in "Revenge of the Swarm". He was presumed dead, his cause of death was unknown. His daughter Elena found some of the Nanochips and studied them. It turned out that she was being controlled by them, and could make them shape shift into anything.
- John DiMaggio - Ben 10: Ultimate Alien
Colonel Rozum is a United States Air Force officer with access to high-profile information, even about the existence of the Plumbers, and has personally known Max Tennyson.
He first met Ben and the team in "Fame", where he was stationed at a base in Florida overseeing the construction, and later investigating the theft of the high-powered rocket engines being developed by NASA to advance Earth to interstellar travel, using an experimental engines that used a form of controlled nuclear explosion as a means of propulsion. They were targeted by Bivalvan.
He returns in "Ultimate Aggregor", Rozum is given the case and is aware of what the government considers to be a failed time travel experiment, the Paradox Project, using an Entropy Pump to generate a weakness in the fabric of space-time allowing travel through time. Rozum was frustrated that Ben's team already knew about the project, due to it taking him years of hard work to gain the clearance necessary. He wanted their help to stop Aggregor from using the Entropy Pump, giving his military strength to assist them should they need. It is in this encounter that he reunites with Max Tennyson and meets Professor Paradox for the first time, where he initially refers to Rozum as Major.
He also appeared again "Prisoner Number 775 is Missing" when area 51 was attacked. Max was outraged to find out that Area 51 was a prison for any aliens that had been caught by Rozum and the military, without due process. One of the Prisoners escaped, and attempted to get revenge on Rozum for his unjustified decades of imprisonment that cost him the life of his family by targeting Rozum's family. After Prisoner 775 was defeated by Ben and taken in by the Plumbers, Rozum showed no remorse over the situation of the prisoner, declaring that he was serving his country and planet, severely putting a strain on his relationship with Max and the team. In "The Ultimate Enemy", he was transformed into an Esoterica by Diagons mind control wave along with every being on earth off screen but later cured by Ascalon when Ben reverted everyone back normal. Rozum would return in Ben 10: Omniverse in "Blukic and Driba Go To Area 51," where he knew Max Tennyson as a young Air Force officer and became involved in the attempts by the alien Benevelon to invade Earth.
- Molly Quinn – Ben 10: Ultimate Alien
Unitrix, also known as Eunice, is a prototype of the Omnitrix created by Azmuth which can absorb, contain and recall the DNA of different species.
Eunice was first introduced in "The Transmogrification of Eunice", when Azmuth lost her, and he hired Sunder to find her. When Ben, Gwen and Kevin find an alien pod, when Gwen opened it she ended up cut by the pod door and the Unitrix became a blonde-haired girl who was unaware of her past. After Gwen gave Eunice some of her extra clothes, Ben got a crush on Eunice and so as she. During the scuffle with Sunder in a muddy area, Azmuth arrived and cleared things up. He stated that Eunice was actually a Unitrix, a prototype of the Omnitrix created when he wanted to preserve alien DNA. Following a brief argument, Ben allowed Azmuth to take on Eunice as one of his assistants on Galvan Prime as a compromise. Azmuth also states that when Gwen cut her hand trying to open the pod containing the Unitrix, her human DNA was sampled and then randomised it, creating Eunice's human form.
In her true form, she is a cylinder core, similar to the Omnitrix and Ultimatrix, however, the core resembles a container instead of a watch, but does feature a control dial that, when pressed down, turns it to its mobile DNA form . As a prototype Omnitrix, the Unitrix is capable of storing DNA of different species, but is not connected to the Codon Stream or Primus, limiting it to a single DNA sample. Eunice was also shown to be able to absorb DNA and powers of several animals and then to manifest traits of these animals without changing form. In addition, local wildlife seemed to be attracted to her to the point where normally shy animals would gather around her and render more dangerous animals docile towards her and others.
In "Simian Says," Eunice goes to investigate the Arachnichimp's planet when she doesn't detect their DNA in Primus' Codon Stream. She helps Ben and company fight Mizaru and the Xenocyte-possessed Arachnichimps. When Eunice got infected by the Xenocyte, Ben was able to hit the button on her neck causing Eunice to regress back into the Unitrix. Eunice made a silent cameo in the Omniverse episode "The Most Dangerous Gameshow", as one of the females abducted by Charles Zenith to participate in an intergalactic competition to win Ben's hand in marriage.
- Patrick Cavanaugh – Ben 10: Ultimate Alien
Winston is a member of the Forever Knights and a squire to Sir Cyrus.
He was attacked by the Lucubra and turned into a mind-controlled slave. He was seemingly cured when Gwen sent the Lucubra back to its home dimension. However, like everyone attacked by the Lucubra, Winston becomes a thrall of Diagon and unconsciously becomes an Esoterica.
In "A Knight to Remember", Winston is a FKC member because he had been mind controlled by the Diagon. Under its control he informed the rest of the Flame Keepers' Circle of where to find Diagon's heart and Ascalon. When Vilgax gained the sword and the heart, Winston, still under the control of Diagon, tricked Vilgax into breaking open the Seal into Diagon's dimension and reuniting Diagon with his heart.
He is killed by Conduit Edwards in "The Beginning of the End" when he saved Sir George. He had been declared a Forever Knight by Sir George in death after Sir George avenged Winston's death.
Ignatius Baumann is a human shopkeeper that owns an alien grocery store on Earth, having known Ben Tennyson since he was five years old and has been a victim of the kid's actions indirectly damaging his store, which intensified since he gained Omnitrix. Baumann is formally introduced in the Ultimate Alien episode "The Purge" when Ben and his team wanted to ask about the Forever Knights at the time when the Forever Knights have been hunting aliens on Earth.
Baumann reappears in the Omniverse episode "The More Things Change". When Ben comes to the store to defend it against Bubble Helmet, Fistina, and Liam, Baumann begs him to leave but ends up despairing from the resulting fight. In "Special Delivery," Ben's fight with Thunderpig ends up wrecking Baumann's car. Baumann has Ben perform deliveries to him without the involvement of the Omnitrix. When Ben manages to finish his deliveries, Baumann gets his car fixed but is mortified after seeing his house destroyed by a food delivery truck that Ben knocked out of Earth as Way Big a year ago returning from orbit.
In "The Frogs of War", Baumann allows Gwen, Kevin, Blukic, and Argit to use one of the hidden rooms in his store to make a plan to stop the Incurseans. In "The Ballad of Mr. Baumann" it is revealed that Baumann has been romantically involved with an aquatic female alien since her arrival on Earth, and he eventually proposes marriage to her and obtains an alien suit to allow him to interact with her at will.
- Paul Eiding - Ben 10: Omniverse
Zed is a dark blue Anubian Baskurr who resembles a dinosaur and dog. She has spiky hair, red eyes, and black lines on her neck and legs. Zed used to wear a red spiked collar with the Nemetrix symbol on it, but now wears a light blue collar with a gold bone dog tag as Kevin's pet.
- Tara Strong - Ben 10: Omniverse
Pakmar is a short alien and self-employed entrepreneur who first appears in Omniverse. A running gag in the series is that his business ventures are constantly being accidentally destroyed by Ben.
He first appeared in "The More Things Change", when his Toilet Emporium had been destroyed as part of Psyphon's protection racket.
In "Of Predators and Prey", Pakmar is shown to have started a pet shop in Undertown when Ben arrives looking for a dog whistle that matches the whistling that commands Khyber's Dog. Pakmar was still angry at Ben for being partially responsible for the destruction of his Toilet Emporium. The pet shop ends up destroyed during Ben's fight with Kyber's Dog. In the episodes that Pakmar appears in Omniverse, he opens a new business that it is destroyed by Ben in "Showdown", where he goes to the Plumbers to complain about Ben. An alternate Pakmar appeared in "It's a Mad...Ben World," where he cruelly hordes Benwood's water in the employ of Mad Ben only to have his operation destroyed by the normal Ben.
Professor Blarney T. Hokestar
- Charlie Adler - Ben 10: Omniverse
Professor Blarney T. Hokestar is an alien con artist, seeking profit yet he is not maliciously attempting any crime. Ben first meets him in "Have I Got a Deal For You" where he was working on a miracle elixer that is made from a small Screegit. When Pax tricks Ben into freeing the Screegit from its cage enough for it to be exposed to Earth's nitrogen and grow to giant size, Professor Hokestar helped Ben by telling him how to defeat the Screegit. After Pax and Solid Plugg were arrested by the Plumbers and the Screegit is in the custody of the Plumbers, Ben tells Professor Hokestar that if he ever comes near the Screegit, he will have him handcuffed to Pax for a year.
In "Store 23," Ben, Blukic, and Driba find Professor Hokestar operating the 23rd Mr. Smoothy restaurant which contains a dimensional transporter that Professor Hokestar was using to sell Mr. Smoothy drinks to different dimensions. One of these dimensions is Dimension 23 where Ben meets that reality's version of Ben. While Ben works with his Dimension 23 counterpart, Professor Hokestar helps Blukic and Driba work to get the dimensional transporter working. With help from Dimension 23's Azmuth, Professor Hokestar, Blukic, and Driba were able to perfect the dimensional transporter.
In "Otto Motives," he is seen in an auto show of Khoros.
In "Collect This," Professor Hokestar creates an intergalactic television show based on Ben Tennyson's adventures with the help of Solid Plugg and a Lenopan actor named Deefus Veeblepister playing Ben.
- Eric Bauza - Ben 10: Omniverse
Pax is a crazed Florauna activist who is not evil at heart but his love for wildlife, especially dangerous animals, places himself and others in danger on a regular basis. Pax first debuts in "Have I Got a Deal for You" when he tricks Ben into freeing the Screegit from Professor Blarney T. Hokestar's ship, unaware of how it would be effected by Earth's atmosphere. When the Screegit went on a rampage, Pax tried to stop Ben and Professor Hokestar from what he perceived to as doing harm to the Screegit. After the Screegit was returned to normal size, Pax was arrested by the Plumbers despite his good intentions. In "Store 23," Pax makes a poster cameo at the time when Feedback was chasing Liam.
In "Rad," Pax returns where he stowed away on Rad Dudesman's ship called The Lucky Duck where he plans to keep the dangerous Gracklflint safe. During a fight with the Incurseans, Pax ended up captured by some Incursean soldiers yet manages to escape when the Gracklflint starts attacking the Incursean soldiers. After the Gracklflint is used to cure Magister Amux and his crew of the venom, Ben assures to Pax that the Gracklflint will be let free on its planet and Rad just says that as long he gets paid.
The Kraaho are hot-blooded tungsten-based aliens that thrive on warm temperatures. When Earth reaches 100 degrees Fahrenheit during a summer day, it is still too cold for pure-blooded Kraaho. Half-breeds like Ester found it slightly nippy; however, cooler weather in "Rules of Engagement" didn't seem to bother her.
- Corey Burton - Ben 10: Omniverse
Seebik was the former leader of the Kraaho. He and the Kraaho first appeared in "Hot Stretch" where they planned to bring out Earth's magma so that they can survive. This plot was thwarted by Ben, Rook, and Ester. Seebik then handed the role of Kraaho leader to Ester. Later, in "Special Delivery," Seebik and a few other Kraaho loyal to him attempt to take the white Dwarf Star core from Ben. When Ben asked Seebik if Ester knew what they were doing, he replied "I hope not" implying that he was going rogue. He and the villains that assisted Psyphon were repelled by Ben.
- Tara Platt - Ben 10: Omniverse
Ester is a Half-Kraaho who first appeared in "Hot Stretch." She was seen stealing a fusion core from a building and was chased through Undertown by Ben and Rook all the way to where the Kraaho were living. She later helped Ben stop Seebik and the Kraaho from bringing the magma up from the Earth. Afterwards, Seebik made Ester the new leader of the Kraaho. According to Ester, the Kraaho will now live in peace with both Bellwood and Undertown. While getting some lemonade to cool off, the Kineceleran children pass by and calls Ben Ester's boyfriend, likewise Ben asks Rook if he had a shot with her, implying a possible relationship of Ben and Ester. It remains unknown what species her mother was, but it's possible Ester's mother was human.
In "Rules of Engagement," Ester comes to Ben for help when the Kraaho are attacked. They find that the person attacking the Kraaho is Princess Looma. During Ben's fight with Princess Looma, Ester, Julie, and Herve are captured by Princess Looma to be involved in Princess Looma's wedding of Ben. After Princess Looma leaves and Julie agrees to remain friends with Ben as she leaves with Herb, Ben leaves with Ester to repair the Kraaho village; adding onto the possibility of romance, Ester said she loves Mr. Smoothy's.
In "Return To Forever," Ben mentioned that he went to a movie with Ester, but Jimmy Jones called it a "date". She later appeared in "Fight at the Museum" where her relationship with Ben was strained as a result of his growing bond with Kai Green. They later broke up at the end of "Most Dangerous Game Show", where Ester was revealed to have a new boyfriend.
- Steven Blum - Ben 10: Omniverse
Hobble is an unidentified alien that is a member of the Plumbers' Alpha Squad. Despite this, he is depicted as an extremely cowardly individual, often fleeing in terror from dangerous situations. His diminutive size is accompanied by poor physical abilities, with his species' main advantage being a protective layer of mucus secreted by their skin that leaves them immune to Corropturas. Hobble briefly had a crush on Charmcaster in "Charmed, I'm Sure", but it went unreciprocated.
- Carlos Alazraqui - Ben 10: Omniverse
Rad Dudesman is a duck-like alien who is a mercenary-for-hire and a smuggler. He is skilled at the use of advanced weaponry and pilots a spaceship called the Lovely Duck. As revealed in his debut episode, he has three middle names: Profit, Trouble, and Danger. He is occasionally employed by the Plumbers to carry cargo and passengers, and has thus met and worked with Ben on a number of occasions. The first was in "Rad" where he helped transport a dangerous creature whose venom was needed to help several Plumbers. He then appeared in the trilogy "Rad Monster Party", "Charmed, I'm Sure", and "The Vampire Strikes Back", in which he became stranded on Anur Transyl with Ben, Rook, and Hobble of the Plumbers. He became quite annoyed with Ben due to Ben's destruction of a needed replacement part, and later became one of Lord Transyl's unwilling minions.
- Carlos Alazraqui - Ben 10: Omniverse
Pyxi is an artificial intelligence that is on Rad Dudesman's ship the Lovely Duck. Pyxi also serves as Rad Dudesman's personal assistant. Although Pyxi speaks gibberish, it can be understood by Rad and the Galvans.
- Carlos Alazraqui - Ben 10: Omniverse
Scout is a Loboan Plumber from the Anur System and is one of the few Plumbers who are stationed in the Anur System. He attended the Plumbers' Academy with Rook. He is forced to build and look for parts needed to for his equipment. Scout explains that he was inspired by Ben's exploits to get his home system ready for joining the rest of the universe.
- David Kaye - Ben 10: Omniverse
Skurd is a Slimebiote who becomes attached to Ben's Omnitrix. When attached to an alien, he can feed on the alien DNA and can grow his host's body parts from himself. When attached to the Nemetrix or Omnitrix, Skurd could grow the body parts of an alien and use it as an armor by spreading to their respective body parts and then shifting into another alien's limb or something based on another alien. This allows a sapient wielder to remain sane by not using the Nemetrix directly. Furthermore, Skurd has a high tolerance for Neural Shifts, which prevents him from going insane as well. He is able to give Ben the powers of the other aliens such as a Diamondhead or Armadrillo arm as well as a Bloxx arm cannon, an Echo Echo megaphone and even Wildvine arms.
Skurd first appears when Khyber seeks him out in search of a new host for the Nemetrix, and Skurd is soon convinced to aid him. However, after an initial encounter with Ben, Skurd begins to covet the Omnitrix's much greater store of DNA, and abandons Khyber when they are confronted by Ben a second time. He then becomes Ben's unwanted companion for much of the remainder of the series, though his abilities do prove helpful. Ben eventually goes to Azmuth to see about having Skurd removed, only to realize how helpful the Slimebiote was and reunite with him to defeat Malgax. After the defeat of Maltruant, Skurd learns that his kind were created by the ancient race known as the Contemelia, who created the universe to spread DNA, and parts ways from Ben to join his primordial brothers at their task.
- Max Mittelman - Ben 10 (Reboot)
Todd is a man with brown hair and wears a light blue T-shirt and khaki pants that first appeared on Waterfilter among with his fiancée Sally. Their moments were directly or indirectly ruined by Ben.
- Tara Strong - Ben 10 (Reboot)
Sally is a woman with blond hair and wears a pink dress.
Shady Looking Dude
- Josh Keaton - Ben 10 (Reboot)
Shady Looking Dude is a wrestler that appeared on The Ring Leader. He has brown hair and black eyes, wears black make-up, black bracelets with grey spikes on them, grey and black suit and black boots.
He fought Four Arms at the Midwest Wrestling Smackdown and attempted to blind him with a crystal ball, but failed due to Four Arms wearing googles and as a result, he was defeated.
- David Kaye - Ben 10 (Reboot)
Steve is an announcer at Midwest Wrestling Smackdown that wears a grey and black cowboy hat, golden rings, grey suit on top of a white and black shirt, and a golden necklace.
It seemed they had a great appreciation for Iron Kyle, until they found out Iron Kyle is a guy in robot suit, much for their disappointment.
- Roger Craig Smith - Ben 10 (Reboot)
Bill is a chubby man of short stature. He wears glasses, a white shirt with a black suit on top, a red bow tie, has a brown Walrus mustache and a brown hair and also one of the announcers at Midwest Wrestling Smackdown.
- John DiMaggio - Ben 10 (Reboot)
Glamour Man is a wrestler that has well developed muscles and blonde hair, wears blue wrestling clothes and dark blue and white shoes and knee braces, and a grey bracelet with spikes on his left knuckle. He distracted Four Arms in order to beat him, but ended up punching himself.
- Tara Strong - Ben 10 (Reboot)
Starshine is one of the people living in the Docile Dragon Domicile and took a vow of silence to keep the Docile Dragon asleep. She first appeared in the episode Shhh! and has brown hair and eyes, a flower necklace on her forehead, wears a blue gown, and brown sandals.
- ( 15 in Alien Force, and 16 in Ultimate Alien and Universe
- 65 in Ben 10: Alien Force, 66 in Ben 10: Ultimate Alien and in Ben 10: Omniverse
- 16 in Ben 10: Alien Force, 17 in Ben 10: Ultimate Alien (through present)