List of Ben 10: Ultimate Alien episodes
|First aired||Last aired|
|1||20||April 23, 2010||December 10, 2010|
|2||12||February 4, 2011||April 29, 2011|
|3||20||September 16, 2011||March 31, 2012|
|Special||November 25, 2011|
Season 1 (2010)
- Now sixteen years old, Benjamin "Ben" Kirby Tennyson wields the all-powerful Ultimatrix he took from Albedo in the two-part series finale "The Final Battle", and has his secret exposed to everyone on Earth, due to a ten-year-old fan of his named James "Jimmy" Jones.
- Sixteen-year-old Gwendolyn "Gwen" Catherine Tennyson's innate magical, Anodite abilities have grown considerably stronger over the year. She begins to cast spells out loud, and reads from the pocket purple-and-gold stripped spellbook, which she had taken from her archival Charmcaster six years ago.
- Gwen Tennyson allows her dormant Anodite self to emerge for a second since "War of the Worlds, Part 2."
- The crazed clown Zombozo makes a comeback since the Ben 10 episode "Last laugh."
- Alien X is revealed to be of omniscient and omnipotent celestialsapians who are born from the Forge of Creation, in the very center of the infinite cosmoverse itself
- Kevin Levin, now seventeen, becomes a power-crazed and vengeful villain once again after he being forced to absorb the supremely powerful and numerous abilities of all the aliens' within the Ultimatrix; thus becoming "Ultimate Kevin"
|Title||Directed by||Written by||Original air date||Prod.|
|1||1||"Fame"||Dan Riba||Dwayne McDuffie||April 23, 2010||101|
Ben's secret identity is revealed to the entire world, and he is now a superhero loved everywhere by kids and teenagers, but distrusted by many adults. Kevin and Gwen find out who revealed Ben's secret and where he lives, and the three go to "pay him a visit". The informant turns out to be a young boy named Jimmy Jones, who has followed Ben's exploits ever since he was ten-years old. With Jimmy's help, Ben and company discover a series of alien attacks in Florida. The unknown alien steals a nuclear device from a prototype interstellar rocket. The group follow the alien to its hideout and defeat it, learning that the alien is from another galaxy, having been kidnapped by a being named Aggregor.Ultimatrix alien debuts: Humungousaur, Jetray, Chromastone, Spidermonkey, Ultimate Spidermonkey
|2||2||"Duped"||Butch Lukic||Len Uhley||April 30, 2010||102|
Julie is playing her first big game, while the Forever Knights are trying to break into a museum. Ben also wants to go see the opening of a new Sumo Slammers movie. To deal with his dilemma, he transforms into Echo Echo and then changes back to human, creating three copies of himself with differing personalities. The arrogant Ben gets sent off to watch Julie's game, the kind Ben goes to help Kevin with the Forever Knights, and the rational Ben goes to watch the movie.Ultimatrix alien debuts: Rath, Echo Echo, Big Chill, Upchuck, Cannonbolt, Lodestar
|3||3||"Hit 'Em Where They Live"||Matt Youngberg||Len Wein||May 7, 2010||103|
After Ben's secret identity is revealed, a bunch of his old enemies start attacking his family as a method of revenge.Ultimatrix alien debuts: Swampfire, Ultimate Big Chill
|4||4||"Video Games"||Dan Riba||Eugene Son||May 14, 2010||104|
Ben is approached by a video game producer in order to make a Ben 10 video game. Unfortunately, this producer is actually working for Will Harangue, who intends to create a robot to destroy Ben. The producer has all of Ben's aliens scanned, in order to have the robot learn their moves. The robot begins to attack, with a climactic showdown happening on the National Wall in Washington, D.C.Ultimatrix alien debuts: Four Arms (16-years-old), Nanomech, Way Big
|5||5||"Escape From Aggregor"||Butch Lukic||Charlotte Fullerton||May 21, 2010||105|
Ben defeats an alien who was rampaging through Bellwood. The alien, named Galapagus, chronicles how he was kidnapped from his home world by Aggregor. He explains how he met four other aliens (Bivalvan, P'andor, Andreas, and Ra'ad), and they escaped him to end up crash landing on Earth. Ben mentions how they already found Bivalvan, and promises to make sure all the aliens are returned home.Ultimatrix alien debuts: Brainstorm
|6||6||"Too Hot To Handle"||Matt Youngberg||Marty Isenberg||May 28, 2010||106|
A strange alien is offering big money (over $1 million) to someone who can open a safe (which is really a containment suit). That alien is revealed to be P'andor, who wants to be free of his suit. Eventually, Kevin accidentally releases P'andor in his radioactive form, whom Ben, Gwen, and Kevin have to stop.Ultimatrix alien debuts: Ultimate Humungousaur, Water Hazard, Ultimate Cannonbolt
|7||7||"Andreas' Fault"||Dan Riba||Jim Krieg and Ernie Altbacker||June 4, 2010||107|
If the castles Argit goes to refuse to let him rule their castles, he will use his new friend Andreas to destroy the castle. Andreas is also one of Aggregor's victims. Jetray then scans Andreas' DNA and gains a new form and transforms back into Ben. Argit gives Kevin money as payment for the money he owes him. Kevin then says that he loves money more than anything else in the world and Gwen gets mad at him for the remainder of the episode. Argit tells Andreas that Ben and his team are friends, but then a Forever Knight intelligence officer named Sir Dagonet comes in and turns Argit's Forever Knight garrison against Ben and his friends.Ultimatrix alien debuts: Goop
|8||8||"Fused"||Butch Lukic||Len Uhley||June 11, 2010||108|
As Ben laments that things can't get worse, Aggregor shows up to recapture Ra'ad. The gang try to fight Aggregor, but he proves to be too strong for them. The Ultimatrix finally lets Ben transform, but unfortunately, all that he can transform into is an Amperi. With no choice, Ben transforms into AmpFibian and fights Aggregor.Ultimatrix alien debuts: AmpFibian
|9||9||"Hero Time"||Matt Youngberg||Steven Barnes||June 18, 2010||109|
Movie star Jennifer Nocturn appears to be in danger, but before Captain Nemesis can act, Ben interferes and saves the day. Jealous, Nemesis stages a competition against Ben, which he loses. Nemesis then kidnaps Julie, who was shown taking her anger over Jennifer out on the tennis courts. Nemesis then intercepts Jennifer's helicopter. When Ben calls Julie, Nemesis answers the call and tells Ben to "come and get me" if he wants to see her again.Ultimatrix alien debuts: Armodrillo
|10||10||"Ultimate Aggregor"||Dan Riba||Dwayne McDuffie||October 10, 2010||110|
Aggregor then begins to absorb energy and Kevin tries to reason with him, explaining that regularly absorbing energy caused him to go insane when he was a kid but Aggregor doesn't listen, claiming that it is a lie told by powerful Osmosians to control the weak Osmosians. Before Kevin can reason with him any further, Aggregor shoots Kevin with his spear. He then powers himself up and breaks the fabric of time.Ultimatrix alien debuts: Ultimate Swampfire
|11||11||"Map of Infinity"||Butch Lukic||Dwayne McDuffie||October 10, 2010||111|
Continued from the previous episode, Aggregor has absorbed the powers of Bivalvan, Galapagus, P'andor, Andreas, and Ra'ad, transforming him into Ultimate Aggregor. Ben transforms into Humungousaur and attacks Aggregor in a fight of rage and anger, seemingly pummeling him unconscious. After this, Aggregor escapes, leaving Azmuth to explain to Ben, Gwen, Kevin, and Grandpa Max what Aggregor's plan is. Now knowing he's trying to get the map of Infinity, Ben and co. head to a temple run by Necrofriggians in an attempt to get a part of the map before Aggregor does.Ultimatrix alien debuts: Ultimate Echo Echo
|12||12||"Reflected Glory"||Matt Youngberg||Peter David||October 15, 2010||112|
The Forever Knights discuss their plan for the weapon and Ben and the team come in to fight with Cash, J.T., and Oliver filming the scene. Kevin gets angry with them not helping and Psyphon comes in to destroy Cash and J.T., believing them to be the masterminds behind Ben Tennyson.Ultimatrix alien debuts: Terraspin
|13||13||"Deep"||Dan Riba||Marty Isenberg||October 22, 2010||113|
|Underwater on Piscciss, a Magister Plumber named Pyke is searching for something. He finds a swimming object, which happens to be Ultimate Aggregor, who seems to defeat Magister Pyke.|
|14||14||"Where The Magic Happens"||Butch Lukic||Matt Wayne||October 29, 2010||114|
|The group is chasing Aggregor, who runs toward a door and shouts an incantation. The door glows symbols and opens to a world that looks like it is full of mana. Unfortunately, Four Arms wasn't strong enough to keep the door open, and it closes. After Four Arms transforms back into normal, Ben remembers the glowing symbols and writes them down, but Gwen is unable to pronounce the symbols correctly. She does know someone who can read them, and that person is Charmcaster.|
|15||15||"Perplexahedron"||Matt Youngberg||Brian Swenlin||November 5, 2010||115|
Azmuth contacts Ben on the Ultimatrix and is not happy with him for failing to stop Aggregor from claiming three of the four pieces to the Map of Infinity. When Ben tells Azmuth that scolding him is not going to help, Azmuth agrees and then teleports Ben, Gwen, and Kevin to the Rust Bucket in another galaxy, in which they find the Perplexahedron, a giant cube-like artificial planet. Moments later, they spot Aggregor approaching the planet.Ultimatrix alien debuts: Ripjaws
|16||16||"The Forge of Creation"||Dan Riba||Dwayne McDuffie||November 12, 2010||116|
With Ultimate Aggregor having all four pieces of the Map of Infinity, he'll be on his way to the Forge of Creation (Alien X's home planet). Professor Paradox helps Ben, Gwen and Kevin get to they need to go, but after Paradox left, Ben and the others ran into Ben's younger self. The four of them arrive at Alien X's home planet, where they battle Ultimate Aggregor and after Kevin gone insane in absorbing Ben's powers he defeated and absorbed Ultimate Aggregor. 10-year-old Ben goes back to where he belong from Professor Paradox.
Omnitrix alien debuts: Heatblast (10-years-old), Wildmutt (10-years-old), Four Arms (10-years-old), Stinkfly (10-years-old)Ultimatrix alien debuts: Alien X, NRG, Ultimate Kevin
|17||17||"...Nor Iron Bars a Cage"||Butch Lukic||Len Wein||November 19, 2010||117|
|Ben and Gwen arrive in Incarceon to tell Morgg that Ultimate Kevin is going to kill him. Morgg ignores their warning and has his robots take them to a room to stay in until a supply ship picks them up. Meanwhile, while the prisoners are still mining, Ultimate Kevin flashes back to the last time he was a prisoner. He was still Kevin 11 and got so angry, that he threatened to hurt all the other prisoners while Quince and his friend, Kwarrel watched him.|
|18||18||"The Enemy of My Enemy"||Matt Youngberg||Len Uhley||December 3, 2010||118|
|While taking a ride in Ben's car, Ben and Gwen discuss that Ultimate Kevin is still continuing his rampage on everyone that wronged him and that he needs to be taken care of. Just then, Ben accidentally runs over Argit, but he survives. Argit explains that he needs their help to hide from Ultimate Kevin.|
|19||19||"Absolute Power, Part 1"||Dan Riba||Charlotte Fullerton||December 10, 2010||119|
|Kevin has been absorbing the powers of the Plumbers' Helpers and Ben and Gwen had an argument whether they should kill or cure Kevin. Ben defeats Gwen and then battle the Forever Knights and Vulkanus to ask where are Kevin's whereabouts but neither of them gave Ben any answers. Gwen finds Ben and tells him that their old enemy Michael Morningstar can help find and cure Kevin.|
|20||20||"Absolute Power, Part 2"||Butch Lukic||Charlotte Fullerton||December 10, 2010||120|
|Halfway to the end of the episode, Kevin is still rampaging. Ben and Gwen use Michael Morningstar, Julie, Ship and Cooper to help cure Kevin. Ben defeated Kevin and in Los Soledad Cooper use the power of the Entropy Pump to turn Kevin back to human and the powers of the Andromeda aliens and the Plumbers' Helpers return.|
Season 2 (2011)
- Verdona, Ben and Gwen's paternal Anodite grandmother, from whom Gwen inherited her magical and Anodite powers, returns since her visit in "What Are Little Girls Made of?" (Episode Eight of Ben 10: Alien Force) In addition, a teenage full-fledged Anodite female named Sunny debuts as Ben and Gwen's first cousin from their paternal Anodite ancestors.
- Dr. Viktor, from the original series' third season, returns.
- Gwen Tennyson starts to use magic more frequently in addition her manna-controlling powers.
- Ben's old crush, from middle school and who debuted in the live-action movie Alien Swarm, Elena Validus makes her 2D animated debut, along with the autonomous nano-chips.
- How the seventeen-year-old Maxwell Tennyson first met a younger Verdona, in the 1960s, is revealed
|Title||Directed by||Written by||Original air date||Prod.|
|21||1||"The Transmogrification of Eunice"||Matt Youngberg||Eugene Son||February 4, 2011||201|
|Ben, Gwen, and Kevin go out into the wilderness for a camping trip. During a car race between Ben and Kevin, a strange pod falls from space. While trying to open the pod, Gwen cuts her hand on it. The pod then opens to reveal a beautiful, dark green-eyed, blonde-haired girl. Gwen gives the girl some of her spare clothes and the girl reveals her name to be Eunice, though she doesn't remember anything else. As the camping trip continues, Eunice is revealed to have a strange connection to nature and Ben begins to develop romantic feelings for Eunice. Sunder then arrives on Earth on a mission to find Eunice.|
|22||2||"Eye of the Beholder"||Dan Riba||Len Uhley||February 11, 2011||202|
|Baz-El is on a distant planet where he is stealing some valuable gems from some temple statues. Later, the temple guardian worshippers attack Baz-El. Ship suddenly hears Baz-El's cries for help, and leaves Julie to help his old owner. Julie ask Ben for help to locate Ship, who left to help Baz-El. However, their break-up makes things difficult, but Gwen and Kevin agree to help Julie.|
|23||3||"Viktor: The Spoils"||Butch Lukic||Kevin Grevioux||February 18, 2011||203|
Zarcovia's soldiers has found the frozen body of Dr. Viktor. Prince Gyula and King Xarion want to see this weapon. Gyula wants to control Dr. Viktor to use him against rebels in their civil war, but Xarion tells him not to. King Xarion asks for help from Ben, Gwen, and Kevin and explains what Gyula is trying to accomplish. When they find Dr. Viktor's corpse, they are found by Gyula's soldiers. While fighting them, Dr. Viktor's ice block begins to melt and he breaks free; Gyula reveals that Dr. Viktor is under his control.
|24||4||"The Big Story"||Matt Youngberg||Ernie Altbacker and Jim Krieg||March 4, 2011||204|
|Jimmy Jones sees a meteor falling in a cave, where an alien plant attacks him. He tells Ben and his team about it, but only Ben believes him. They go in the cave but the plant isn't there. The next day, Jimmy sees Ben going into the cave and talking to the plant. He takes a photo of that, but the photo isn't good, so Gwen doesn't believe him. Later, Jimmy goes to the supermarket and Ben, as Humongousaur, attacks him. Jimmy takes his bicycle and runs, but Ben becomes Cannonbolt and hunts him down. Jimmy goes to Gwen and Kevin and they all go to the cave. In the entrance of the cave they catch Jimmy and they take him to the plant. Jimmy finds that Gwen, Kevin, and Ben are clones made by the plant.|
|25||5||"Girl Trouble"||Dan Riba||Eugene Son||March 11, 2011||205|
The team goes to Gwen's house to find a solution to defeat Computron's minions from Dimension 12. When they go to Gwen's room, they find a dark-hair girl, who is Sunny, Gwen's cousin. Gwen's mom insists they take Sunny with them. The team takes Sunny to the mission but they left her in Kevin's car. They go to fight the robots but Sunny follows them. She destroys the robots with ease and is very happy, but the team is looking at her strangely. Gwen tells her mother Natalie that Sunny is an Anodite, much to her surprise and disgust.
|26||6||"Revenge of the Swarm"||Butch Lukic||Stan Berkowitz||March 18, 2011||206|
|One year after the events of Ben 10: Alien Swarm, Victor Validus attacks Ben at night but when he defends himself, he finds a Nanochip that was believed to have been destroyed along with its queen. Ben, Kevin and Gwen find Victor's daughter, Elena who was once Ben's middle school sweetheart, to see what is going on.|
|27||7||"The Creature from Beyond"||Dan Riba||Len Uhley||March 25, 2011||207|
|An evil creature known as Lucubra released from another dimension has plans to enslave the human race for its master. The Forever Knights intend to annihilate the creature at all costs and refuse Ben's aid. Fortunately, Gwen ultimately succeeds in utilizing her increasingly strong magic to send it back from whence it came.|
|28||8||"Basic Training"||Butch Lukic||Adam Beechen||April 1, 2011||208|
Ben, Gwen, and Kevin are summoned to Plumbers Academy to go under training. They create a good friendship with an alien named Tack and Ben dislikes the drill instructor, Magister Hulca, that is being targeted for revenge by a menacing Tetramand.
|29||9||"It's Not Easy Being Gwen"||Matt Youngberg||Matt Wayne||April 8, 2011||209|
|Gwen must juggle things around, in which she has to help Ben and Kevin recapture Dr. Animo, fill out invitations for her mother Natalie's family reunion, help Kevin get into school, finish exams, and go to her best friend Emily's piano performance.|
|30||10||"Ben 10,000 Returns"||Matt Youngberg||Dwayne McDuffie||April 15, 2011||210|
Following a visit from Paradox after a fight with Eon, Ben 10,000 from an alternate future arrives twenty years from the future to seek the aid of his past counterpart in tracking down Eon. It is revealed that Eon is actually an adult Ben from an alternate world, and that he wants to destroy all of the other Bens to become the one and only Ben Tennyson.Ultimatrix alien debuts: (By Ben 10,000) Ultimate Ben, Clockwork
|31||11||"Moonstruck"||Butch Lukic||Len Uhley||April 22, 2011||211|
|Max tells Kevin, Gwen, and Ben how he first met Verdona when he was seventeen years old in the 1960s, which led to their romance and eventual marriage which naturally led to the births of Ben and Gwen's fathers Carl and Frank many decades later.|
|32||12||"Prisoner Number 775 Is Missing"||Dan Riba||Peter David||April 29, 2011||212|
The secrets of Area 51 are revealed to Ben Tennyson after Old George infiltrates and destroys it, setting free the 775th prisoner.Ultimatrix alien debuts: Ultimate Wildmutt, ChamAlien
Season 3 (2011–12)
- The true ultimate purpose of the Forever Knights is revealed.
- In her home world of Ledgerdomain, Charmcaster has become corrupt and intended to return her father Spellbinder to life by offering the vital essences of every living being. This resulted in the brief deaths of Ben, Kevin and Gwen. Her true name is revealed to be "Hope".
- Vilgax is revealed to have survived "The Final Battle" and is worshiped by the Esoterica, who believe him to be Diagon due to their squid-like appearances.
- Influenced by the queen of the sentient microchips of the live Alien Swarm movie, set one year ago, Elena Validus returns and continues to keep Ben and Julie apart by taking on her form to win Ben's affections
- The reasons why the Omnitrix and Ultimatrix were made are revealed in Azmuth's memories in "Solitary Alignment"
|Title||Directed by||Written by||Original air date||Prod.|
|33||1||"The Purge"||Butch Lukic||David McDermott||September 16, 2011||301|
|Old George brings the Forever Knights in one group to vanquish every alien being on Earth.|
|34||2||"Simian Says"||Matt Youngberg||Charlotte Fullerton||September 23, 2011||302|
|Simian accidentally unleashes a Xenocyte Queen which orchestrates an invasion of the Arachnichimps' planet. When Eunice goes missing, Ben, Gwen, and Kevin end up helping Simian liberate the Arachnichimps' planet from a DNAlien version of the Arachnichimp Mizaru.|
|35||3||"Greetings from Techadon"||Dan Riba||Charlotte Fullerton||September 30, 2011||303|
|Techadon robots go after Ben on orders from Vulkanus to attain the Ultimatrix. Gwen and Kevin go across space to prevent Vulkanus from getting what he is after.|
|36||4||"The Flame Keepers' Circle"||Dan Riba||Brian Swenlin||October 7, 2011||304|
|Julie joins a cult called the Flame Keepers' Circle. Unfortunately for her, Ben discovers that the Flame Keepers' Circle worships Vilgax; whom they mistake for Diagon because of his squid-like appearance.|
|37||5||"Double or Nothing"||Matt Youngberg||Len Uhley||October 14, 2011||305|
|Albedo profits from Ben's fame and creates a play about him with the help of three alien actors based on several of the extraterrestrial forms in Ben's Ultimatrix.|
|38||6||"The Perfect Girlfriend"||Dan Riba||Stan Berkowitz||October 21, 2011||306|
|Elena Validus and the nanochips return and impersonate Julie while the real Julie is at a tennis tournament overseas. Ben does not catch onto this until the very end when the real Julie returns and causes Elena to realize that she had never really loved and cared about the real Ben in the first place. Now knowing what true hatred is, Elena disappears with a promise to return.|
|39||7||"The Ultimate Sacrifice"||Butch Lukic||Dwayne McDuffie and J.M. DeMatteis||October 28, 2011||307|
The ultimate aliens inside Ben's Ultimatrix demand their freedom and end up sucking Ben into the Ultimatrix. While Gwen unleashes her astral projection (in the form her innermost anodite self) enters the Ultimatrix to help Ben, Kevin travels to planet Galvan Prime to convince Azmuth to help.
|40||8||"The Widening Gyre"||Matt Youngberg||Eugene Son||November 4, 2011||308|
|The gang look into the Pacific Garbage Vortex when some people have gone missing. When they arrive, they find the missing people and two agents sent by Colonel Rozum while dealing with giant seagulls and a sentient trash monster.|
|41||9||"The Mother of All Vreedles"||Dan Riba||Matt Wayne||November 18, 2011||309|
|Ma Vreedle plans to spawn an army of Pretty Boy Vreedle clones, which could dry up Earth's oceans.|
|42||10||"A Knight to Remember"||Butch Lukic||Len Uhley and Matt Wayne||December 2, 2011||310|
Vilgax and the Flame Keepers' Circle fight against George and the Forever Knights along with Ben. Vilgax gets Diagon's heart and ends up being sucked into Diagon's dimension.Ultimatrix alien debuts: Eatle
|43||11||"Solitary Alignment"||Matt Youngberg||Peter David||December 9, 2011||311|
|Azmuth reveals in his memories how Old Sir George had acquired the great and mighty sword of Ascalon, and how he had sealed Diagon the first time millennia ago. In addition, he reveals the real reasons for his eventual creation of the Omnitrix and Ultimatrix.|
|44||12||"Inspector 13"||Butch Lukic||Geoffrey Thorne||February 4, 2012||312|
Techadon Weapon Master Number 13 arrives on Earth and demands to have the Ultimatrix. A malfunction grants Gwen and Kevin the forms and unique abilities of some of Ben's aliens.Ultimatrix alien debuts: Clockwork
|45||13||"The Enemy of My Frenemy"||Matt Youngberg||David McDermott and Brian Swenlin||February 11, 2012||313|
|With the help of Hex, Gwen and the gang set out to rescue Charmcaster from her home world of Ledgerdomain. However, they are shocked to learn that Charmcaster's intentions bode ill for them all.|
|46||14||"Couples Retreat"||Dan Riba||Geoffrey Thorne||February 18, 2012||314|
|Darkstar romantically charms Charmcaster and uses her abilities to absorb energy from Ledgerdomain itself. Meanwhile, Gwen and Kevin have a disagreement over the protection of one of her spellbooks.|
|47||15||"Catch a Falling Star"||Butch Lukic||Len Uhley||February 25, 2012||315|
|Jennifer Nocturne runs away with Captain Nemesis after freeing him from jail in hopes of creating a new life with him. Ben and Gwen pursue them, thinking Jennifer has been held against her will.|
|48||16||"The Eggman Cometh"||Matt Youngberg||Stan Berkowitz||March 3, 2012||316|
Dr. Animo returns with a plot to transform eggs into pterodactyls.Ultimatrix alien debuts: Jury Rigg
|49||17||"Night of the Living Nightmare"||Dan Riba||Don McGregor||March 10, 2012||317|
|Albedo returns and infects Ben with a Cassiopeian Dream Eater, trapping him into a dream world where he kept being attacked by several of his enemies.|
|50||18||"The Beginning of the End[a]"||Butch Lukic||Dan Riba||March 17, 2012||318|
|The Forever Knights battle Diagon's minions and Ben's plan to help the knights fails as they are, too, intent on fighting him to listen to reason.|
|51||19||"The Ultimate Enemy: Part 1"||Matt Youngberg||Matt Wayne||March 24, 2012||319|
|Ben, Gwen, Kevin, and George try to stop Diagon's resurrection, but first, they must defeat the demon's herald: Vilgax, now merged with a Lucubra and stronger than ever. To make matters worse, Dagon releases a wave that transforms everyone on the planet into an Esoterica, save Ben, Gwen, Kevin, George, Julie, and Ship.|
|52||20||"The Ultimate Enemy: Part 2"||Dan Riba||Dwayne McDuffie||March 31, 2012||320|
Ben fails to defeat the extradimensional Diagon, who proceeds to destroy Sir George by electrocuting him with dark lightning. Vilgax returns, capturing Diagon by Psyphon's power-absorbing machine. Psyphon proceeds to transfer Diagon's power to Vilgax, making the galactic conqueror into a nearly-unstoppable force. Ben wields George's supremely powerful sword, Ascalon, and uses it to drain Diagon's vast strength from Vilgax into it. Reverted to his original form, Vilgax tries to corrupt Ben, asking what he plans to do with the combined power of Ascalon, Diagon, and the Ultimatrix but Gwen and Kevin both encourage Ben to resist Vilgax's temptation. Ben uses his abilities to transform the Esoterica back into humans. Azmuth appears before them and asks Ben to return Ascalon and the Ultimatrix to him. He gives Ben a new-and-improved version of the Omnitrix he had received six years previously.
Crossover Special (2011)
|Title||Directed by||Written by||Original air date|
|"Ben 10 / Generator Rex: Heroes United[c]"||Chris Graham and Kenji Ojo||Man of Action||November 25, 2011|
Benjamin "Ben" Kirby Tennyson teams up with sixteen-year-old Rex Salazar to save both of their Earths from a very powerful and deadly nanite-of-nanites called "the Alpha Nanite", the enhanced technological force of the Omega Nanite which resides within Rex's body, having integrated into his DNA one year ago that entered New York City through a swirling vortex from an entirely different alternate universe, the same way Ben Tennyson arrived in the city as Humungosuar. After a brief skirmish and getting to know one another, the two superpowered heroes of aliens and machines unite to put a stop Alpha's plan of draining Rex dry of his great and powerful Omega Nanite to dominate both realities with their combined power.
|Volume||Season||Aspect ratio||Episodes||Time length||Release date|
|1. Ben 10: Ultimate Alien – Escape From Aggregor||1||16:9||10 (Episodes 1–10)||223 minutes|| January 11, 2011|
|2. Ben 10: Ultimate Alien – Power Struggle||1||16:9||10 (Episodes 11–20)||230 minutes|| May 3, 2011|
|3. Ben 10: Ultimate Alien – The Return of Heatblast||2||16:9||10 (Episodes 21–30)||230 minutes||August 2, 2011|
|4. Ben 10: Ultimate Alien – The Wild Truth||2, 3||16:9||12 (Episodes 31–42)||276 minutes||December 6, 2011|
|5. Ben 10: Ultimate Alien – The Ultimate Ending||3||16:9||10 (Episodes 43–52)||220 minutes||April 17, 2012|
- List of Ben 10 episodes
- List of Ben 10: Alien Force episodes
- List of Ben 10: Omniverse episodes
- List of Ben 10 (2016 TV series) episodes
- "Ben 10 Ultimate Alien Volume 1 DVD". Amazon.com. Retrieved 2011-11-04.
- "Ben 10 Ultimate Alien: Power Struggle DVD". Amazon.com. Retrieved 2011-11-04.
- "Ben 10: Ultimate Alien – Volume 3: The Return of Heatblast DVD Information". TVShowsOnDVD.com. 2011-02-08. Archived from the original on 2011-09-15. Retrieved 2011-11-04.
- "Ben 10 Ultimate Alien: The Return of Heatblast: Amazon.ca: DVD". Amazon.ca. Retrieved 2011-11-04.
- David McCutcheon. "Ben 10's Wild Truth Exposed on DVD". Uk.dvd.ign.com. Retrieved 2011-11-04.
- "Ben 10: Ultimate Alien – Announcement for 'Volume 5: The Ultimate Ending' on DVD". Archived from the original on 2012-01-09. Retrieved 2011-12-21.