List of Teenage Mutant Ninja Turtles (2012 TV series) characters
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This is a list of characters from Teenage Mutant Ninja Turtles, an American animated series based on the eponymous franchise that premiered on September 29, 2012 on Nickelodeon in the United States and that premiered on YTV in Canada.
A team of humanoid mutant red-eared sliders who are kept a secret from the world by usually going to the surface only in the night time.
- Leonardo / "Leo" (voiced by Jason Biggs in season 1 and most appearances in season 2, Dominic Catrambone in various episodes in season 2, Seth Green in season 3) - Hamato Leonardo is an enthusiastic ninjutsu student, learning how to be an effective leader for his three often unruly brothers. He wears a blue mask and fights with two katana swords called Niten Ryu. Aside from his sensei, he takes leadership references from his favorite sci-fi cartoon series Space Heroes which annoys his brothers to no end, but also gives vital plot points to an episode. In this incarnation, his skin seems darker than his brothers'. Leo's biggest fear is losing his team and getting blamed for failure. Leo drives the Shellraiser.
- Donatello / "Donnie" (voiced by Rob Paulsen) - Hamato Donatello is in charge of the design and manufacture of all of the tools and weapons in the Turtles' arsenal. He is also a gifted hacker. He wears a purple mask and fights with a rokushakubo which converts to a naginata via a blade inside one end of the staff. He also has a crush on April, which his brothers all tease him about. This incarnation of Donatello is depicted with gap teeth. Rob Paulsen had previously voiced Raphael in the original 1987 TV series. Donnie is in charge of maintaining the Shellraiser's systems, and using its on-board laboratory. In the second season, he and Casey Jones are in a rivalry due to them both having a crush on April. Donnie's worst fear is April rejecting him.
- Raphael / "Raph" (voiced by Sean Astin) - Hamato Raphael often lets his impulsiveness get in the way of rational thinking. He wears a red mask and fights with two sai. While hot-headed, he has a soft side, as demonstrated by his interactions with his pet turtle Spike. When Spike was mutated into Slash, Raphael lost the only creature to share his "deep thoughts" with. This incarnation of Raphael is depicted with a lightning bolt-shaped crack in his upper left plastron. In "Cockroach Terminator," it was revealed that Raphael was afraid of cockroaches until he managed to defeat the mutant cockroach Spyroach. However, in "Fungus Humungous", Raph is still afraid of the mutant cockroach Spyroach. Raph is in charge of the Shellraiser's weapons systems.
- Michelangelo / "Mikey" (voiced by Greg Cipes) - Hamato Michelangelo is a lover of video games, skateboarding, pranks and pizza. He wears an orange mask and fights with two nunchaku which convert into kusarigama via a blade inside of one of the sticks of each nunchaku and extra lengths of chain stored in the other. Mikey has a great skill of water balloon launching which could have defeated the Shredder if Karai did not interfere. Mikey's lack of intelligence is constantly used by his brothers. He was used as bait for mutant Kirby in a costume which he named "Tur-fly-tle". Despite possessing a childlike innocence, he always brings his best game to a fight. Mikey's worst fear is Squirrelanoids. Mikey is in charge of navigating the Shellraiser and is also the one that discovered the anime Super Robo Mecha Force Five.
- Hamato Yoshi / Splinter (voiced by Hoon Lee) - Hamato Yoshi was a Japanese ninjutsu master and son to the leader of the Hamato Clan, whose rivalry with the Foot Clan had seen its end when he was still a child. It was this victory that brought into his family Oroku Saki (Shredder), the child of the Foot Clan's leader. Together, they were raised as brothers, and maintained an intense but healthy competition in their ninja training. However, this brotherhood was tested (and failed) when the two men fell in love with the same woman, Tang Shen, who ultimately chose Yoshi over Saki. As a result, ultimately because of Saki's own jealousy and hatred, their brotherhood had ended bitterly. Yoshi and Tang Shen married and had a daughter, named Miwa. Shredder, still bitter over the loss, sought to finish Yoshi. During their struggle, a blow meant for Yoshi took the life of Tang Shen, and Shredder, blaming Yoshi for his own error, burned down Yoshi's home and left him for dead. In disgrace at the loss of both his wife and child, Yoshi left Japan to start a new life in America under his old code name, "Splinter". After moving to New York City, Splinter had just purchased Turtles, who were four baby non-mutated red-eared sliders back then, from a pet shop when he was bumped by a strange man in the street. According to Splinter, something felt 'off'" about the man, so he followed him and witnessed a suspicious conversation between two humanoid Kraang robots. The Kraang spot Splinter and attack him to keep him quiet. During the fight, a canister the Kraang were carrying breaks open and splashes Splinter and the Turtles with an alien chemical, transforming Splinter into a humanoid mutant brown rat (with the mutation contributed by the step on a brown rat while entering the alley). Realizing he could no longer live a normal life on the surface, Splinter retreats to the sewers where he raises his pets as his sons and teaches them the ancient Japanese fighting art of ninjutsu. He is very protective of his sons and can sometimes be overprotective. Being a master of ninjutsu, he is capable of defeating a powerful opponent like Leatherhead. However, given part of his DNA is that of a rat, he proves susceptible to the mind manipulations of the rodent-controlling Rat King, who forces him to battle his own sons. It takes Leonardo reminding him of his humanity that enables Splinter to break Rat King's hold over him and defeat his would-be controller. In "Showdown" Pt. 2, Splinter finds out from Shredder that his daughter Miwa is still alive. When he was about to end his former friend, Karai comes to Shredder's rescue. Splinter recognizes her as his daughter and immediately withdraws from the fight and retreats back to the lair. Splinter only hints at learning more from Shredder to his sons, who had just saved New York from the Kraang invasion, rather than make their victory feel hollow. Eventually, in "Follow The Leader," Splinter chooses to tell Leonardo the truth first. Splinter's rivalry with Rat King in "Of Rats and Men" again tests his limits as a human-rodent hybrid. Using Rat King's own handicap (sight only through the eyes of his rodent subjects to compensate for his blindness), Splinter blindfolds himself and does battle with Rat King until he accidentally falls off a cliff to his certain death. Splinter is again brought face to face with both Shredder and Karai in "The Manhattan Project" when he is defeated and abducted by Shredder's new lieutant, Tiger Claw. Drugged, he tries once more in vain to convince Karai of the truth, and is forced into an unfair battle with Saki until the Turtles return to rescue him. It is only when he meditates and shakes off the effects of the drugs do the tables turn and a victory is secured over Tiger Claw. In "The Lonely Mutation of Baxter Stockman," Donatello's discovery of a retro-mutagen offers Splinter a return to human form, but given the supply is so little, he willingly sacrifices that chance so that his sons can restore April's father (mutated in "The Mutation Situation") to normal. Karai, unsure of who to believe, feigns a defection to the Turtles' side while planning an attack on the lair with Tiger Claw. Splinter shows Karai a completed copy of the photo she carries around with her of her mother (the completed image being of both Yoshi and Shen), and makes her believe him finally. But their reunion is short-lived as Tiger Claw overpowers her and delivers her back to Shredder, who locks her away. In "Vengeance is Mine," Splinter is once more reunited with Karai after the Turtles' successful rescue attempt. However, he makes the mistake of confiding the entire story of how her mother died to Karai, prompting her to return to Shredder's stronghold to exact vengeance. This results in her again being captured and used as bait to lure the Turtles into a vat of mutagen tainted with serpent DNA (a rat's natural predator). In the course of the rescue attempt, Leonardo tries to free Karai (suspended over the vat), but Shredder's swipe of his gauntlet meant for Leo cuts the chain instead. Both Shredder and Splinter watch in horror as Karai is mutated into a serpent creature with snakes for hands. Again, Saki blames his own mistake on Yoshi, and Splinter barely manages to get through to his daughter before she escapes the fire that her struggle started in the lab. Leo tries to apologize to Splinter for allowing Karai to escape the lair, but Splinter is too overcome with grief to acknowledge it.
- April O'Neil (voiced by Mae Whitman) - April O'Neil is the 16 year-old daughter of Dr. Kirby O'Neil who befriends the Turtles after the Kraang kidnaps her and her father. After the Kraang gets away with her father, April's aunt takes her in and the Turtles promises to helping her find her father and takes down the Kraang. In "Monkey Brains", Splinter learns April has a special spiritual sensitivity and offers to training her to be a kunoichi, which she accepts. As the series progresses, her training starts to pay off. In "TCRI", it is revealed that her father's abduction had nothing to do with his area of expertise but because of the Kraang's unknown plans for April. In "Baxter's Gambit", April learns about Splinter's family and compliments his daughter saying she's beautiful, he shows her the weapon that he was going to give to her, a Japanese war fan, Splinter decides to give it to April. In "Karai's Vendetta", April fights Karai and narrowly beats the better kunoichi. Afterwards, April is forced to stay in the sewers with the Turtles now that the Foot Clan and the Kraang are after her. In "Showdown" Pt. 1, the Kraang mind-controls Kirby to hand April over to Karai so that she can be given to the Kraang. In "Showdown" Pt. 2, April awakens in the Technodrome in the presence of Kraang Prime, who states that her mental energy is what is needed to transform Earth so that the Kraang can live on it. Kraang Prime then begins to siphon the mental energy from April, but she is successfully rescued by the Turtles. In "The Mutation Situation", April's friendship with the Turtles is strained after she learns that one of their attacks on the Kraang was responsible for transforming Kirby. In "Mutagen Man Unleashed," April befriends Casey Jones upon becoming his tutor. She ends up stalked by Mutagen Man who has developed a crush on her. When the Turtles are fighting Mutagen Man, April works to keep Casey from seeing them. In "Target: April O'Neil," Karai tries to hunt April down again. April's friendship with the Turtles is rekindled after they rescue her from Karai. In "The Kraang Conspiracy," the Kraang have been shown to have made clones of April O'Neil including a "derp" clone. When Raph is attacked by the Kraang while trying to save April from the DNA extraction machine, April suddenly unleashes a psychic blast. Afterwards, Donnie studies April's DNA and finds that there is some Dimension X alien DNA in her claiming that she is a human/alien hybrid. The news of this has left April shocked. However, it does explain why Kraang water didn't have a corrosive effect on her. In "The Lonely Mutation of Baxter Stockman," Stockman-Fly captures April in a plot to merge with her in the mutagen and become one. During a fight between Leo, Donnie, Casey, and Stockman-Fly, the rope holding April breaks and she falls into the mutagen despite Donnie's attempts to catch her. However, it was revealed that April was immune to the mutagen's effects due to her alien DNA. In "Fungus Humungous", April's worst fear is bats and the loss of her father.
- Kirby O'Neil (voiced by Keith Silverstein) - Kirby O'Neil is the psychologist father of April O'Neil who meets the Turtles when he and April were captured by the Kraang. Although April was rescued by the Turtles, the Kraang made off with Kirby. In "The Gauntlet," the Turtles learn from Kirby that the Kraang have been abducting scientists so that they can help modify the unstable mutagen. The Turtles were unable to rescue Kirby as he was recaptured, buying the Turtles time to escape. In "TCRI", it is revealed that Kirby O'Neil is a psychologist and that his abduction has nothing to do with the mutagen....the Kraang's real target is April. In "Operation: Breakout," Kirby is officially rescued by the Turtles and reunited with April. However, he has fallen under the Kraang's control. In "Showdown" Pt. 1, the Kraang control Kirby into handing April over to Karai and the Foot Ninjas. In "Showdown" Pt. 2, the Turtles discover the mind-control device on the back of Kirby's neck and free him. In "The Mutation Situation," Kirby has been having recurring nightmares about the Kraang. Kirby ends up helping the Turtles track down a Kraang stealth ship carrying a shipment of mutagen. When a mutagen canister falls towards April, Kirby protects his daughter from the canister and falls off the roof. As a result, the canister lands on Kirby instead, transforming into a humanoid mutant vampire bat with a large head, wings on his back, ears shaped like bat wings, a small right arm, and the retaining of his red hair and beard (with the mutation contributed by the fall past a flock of vampire bats) that Mikey dubs, against Donnie's wishes, dubs "Kirby-Bat" (which is what the action figure of his mutated form is referred to) and "Wingnut" (a classic character, although the Wingnut reference was just a joke). Kirby-Bat chases after April and flies off with her. When April awakens on another roof, the mutated Kirby arrives and regurgitates what he would consider food, such as rats and garbage. With Michelangelo dressed up as a butterfly which he named "Tur-fly-tle" as part of a plan to get Kirby-Bat, the turtles use Mikey as bait to trap Kirby-Bat in the warehouse by drawing Kirby's mutated form towards them. The Turtles struggle to get through to Kirby's side as they work to trap him in the warehouse. Once inside the warehouse, the Turtles trap him in a cage as April catches up to them. As Donnie vows to find a way to cure Kirby-Bat, he breaks free and ends up flying off. The mutation of Kirby had temporarily put a strain in April's friendship with the Turtles. In "Fungus Humungous", he appears as hallucination as one of April's fears, which are bats. In "Metalhead Rewired," Kirby-Bat was among the mutants captured by Kraang in order for them to control them. He was first discovered by the Turtles in his cell. Then he, Spyroach, a Parasitic Wasp and a Squirrelanoid discovered that Metalhead opened their cells. He was then attacked by two Kraang, but Donnie kills the two aliens with his bo staff. He then tells Kirby to head to the portal for April. With help from Metalhead, the Turtles freed the captive mutants and they escape through the portal, leaving Kirby's location a mystery. In "The Lonely Mutation of Baxter Stockman," Kirby-Bat assists the Turtles into fighting Stockman-Fly over the retro-mutagen prototype. When the retro-mutagen hits a street light, April steers Kirby-Bat under one of the falling drops which is enough to regress Kirby-Bat back to Kirby O'Neil. In "The Wrath of Tiger Claw", Kirby is seen trying to call his daughter, but is unable to and he says that his daughter always answers the phone.
- Spike / Slash (voiced by Corey Feldman) - Spike was Raph's pet snapping turtle. Raph has a soft spot for Spike, and often talks to him about his feelings in private. This is important for Raph as he needs Spike as a sounding board for his inner thoughts and feelings. He can't reveal his feelings to his brothers so he shares them with Spike, who can't speak, but is an excellent listener. His brothers tease him about this sometimes. Spike's favorite food is lettuce leaves, which he is often seen eating. Raph often lets Spike ride around on his shoulder. In "Slash and Destroy," Spike mutates by drinking some Mutagen that spilled in Raph's room after he had confiscated it following an incident that nearly killed Spike. Upon understanding about what Raph has to go through, Spike renames himself "Slash", obtains a mace for a weapon, puts on a black mask, and states to Raph that they need to lose some dead weight when they head out to find a mutagen container. During the mission, Slash started attacking Donnie and Mikey where Raph claims that the mutation has warped Slash's mind. As Slash plans to dispose of Mikey and Donnie, Raph states that he didn't want this happening to his brothers. Slash states that there is no turning back now. Raph ends up working to prevent Slash from disposing of Donnie or Mikey, only to learn from Slash that Slash has spent years watching Raph train and knows what he can do. Raph comments that he doesn't know all of his moves. Their fight wrecks the area where Leo is having tea time with a girl who was using the "mutagen" to pass as tea. Leo ends up showing up to help Raph only to knock him down. During the fight, Raph hits a vulnerable part on Slash's arm and falls off the building. When Raph looks over the building, Slash's body is gone as the Turtles suspect that Slash had gotten away. In "Metalhead Rewired," Slash was among the mutants captured by Kraang in order for them to control them. He was first discovered in his cell, while yelling at the Kraang. He was then released by Metalhead as he begins to destroy the Kraang for capturing him. Slash did help Raph defeat some Kraangdroids and then escaped with Pete and Spider Bytez. With help from Metalhead, the Turtles freed the captive mutants and they escape through the portal. In "Newtralized," Slash was freed from the Kraang by Newtralizer and the two of them worked together to stop the Kraang's plots. Of course Slash was concerned over Newtralizer's motives involving the humans getting in the crossfire. During the fight at the docks, Slash went against Newtralizer's plot to annihilate the Kraang and the city at the same time causing Raph to help Slash out. After Newtralizer and the Kraang Walker he was piloting were defeated, Raph states that there is a room back in the Ninja Turtles' lair for him. Slash declines stating that he is walking his own path and leaves Raph on equal terms.
- Pete (voiced by A.J. Buckley) - Pete is a woodpigeon that was mutated by the Kraang, learning to talk and befriending Kirby O'Neil, who used him to send a message to his daughter. Pete has a strange yet large craving for bread and will do anything to get some. He told the Turtles the location of where Kirby is in exchange for some bread. In "Metalhead Rewired," Pete was among the mutants captured by Kraang in order for them to control them. He is seen shortly with a Squirrelanoid and a Parasitic Wasp, then he makes for the portal with Slash and Spider Bytez. With help from Metalhead, the Turtles freed the captive mutants and they escape through the portal.
- Leatherhead (voiced by Peter Lurie) - Leatherhead is an alligator that was originally owned by a young boy until his parents found out and flushed him down the sewer. The Kraang took him to Dimension X, mutated him, and experimented on him. Leatherhead eventually escapes from the Kraang, steals the energy source that powers the portal between the Kraang dimension and Earth, and retreats to the sewers. The Kraang locate and attack Leatherhead, to demand the return of the power cell. The Turtles witness this event and Mikey urges his brothers to help intervene. The Turtles protect Leatherhead, restore his health, and keep the power cell from the Kraang. In "TCRI," Leatherhead tells the Ninja Turtles where the Kraang's base is by drawing the shape of the TCRI building. Leatherhead helps the Turtles by attacking the Kraang while the Turtles make their way to the top of TCRI. Leatherhead even helps to fight Traag which ends with Leatherhead dragging Traag back to Dimension X. In the episode "Mazes & Mutants," the Turtles encounter the fire-breathing dragon who resembles Leatherhead, but bigger. Mikey, believing it to be his long gone friend, refused to fight because of their friendship, only to find out that wasn't the real Leatherhead. The illusion was seen again when Sir Malachi left.
- Hamato Miwa / Karai (voiced by Kelly Hu) - Karai is Splinter's daughter. As a baby, Karai was taken away from Splinter by Shredder, and raised as a member of the Foot Clan. She is also an expert kunoichi. She first appears in a duel with Leo, while the other Turtles are out looking for Snakeweed. Karai tries to encourage Leo to break the rules for a change, daring him to help her steal a sword once owned by swordsman Miyamoto Musashi. When Leo's life is threatened by Snakeweed and he asks for her help, Karai throws a knife toward him, (which helps him break free), which Leonardo interprets as an act of friendship but which Raph considers malicious. She later attacks the Turtles at the Kraang's World Wide Genome Project. Karai pushed a button which causes all the animal and plant DNA to be dumped into the mutagen resulting in the creation of a composite beast, Justin. Karai escaped with the Kraang robot body and presented it to Shredder as Baxter Stockman gets to work studying the technology. Shredder then assigns Karai to learn more about the Kraang so that he can use whatever information is gathered about them in his war against the Turtles. In "Karai's Vendetta," Shredder interrogates a captured Kraang (even when Karai informs them on how they work their exo-skeletons) on why they have been hunting the Turtles and learns that they are protecting April O'Neil. Shredder ends up sending Karai to capture April in order to draw the Turtles to him. After a chase throughout the city, April manages to trick Karai into letting her guard down by mentioning that her mother is dead (which is the same with Karai) and throws Karai down the subway stairs. In "Showdown" Pt. 2, Karai comes to Shredder's aid as Splinter is about to deliver the finishing blow. He immediately recognizes her as his long-lost daughter Hamato Miwa, but Karai reveals she believes Splinter killed her mother Tang Shen, a lie fed to her from birth by Shredder. Upon learning this, Splinter evades Karai's attacks and retreats in sadness. In "Follow the Leader," Karai trains with the Foot Bots until Shredder arrives. Shredder tells Karai not to do any actions towards the Turtles while he is in Japan dealing with an urgent matter. Karai goes against Shredder's orders and decides to test the Robot Foot Soldiers on the Turtles. When Leo gets captured, Karai has the Foot Bots attack Leo as part of their training at the Bradford Dojo where they managed to defeat them. Upon the other Turtles arriving, Karai has the Foot Bots restrain the Turtles so that she can draw Splinter to her. When the Turtles make a tactical retreat, Karai orders the Foot Bots to pursue them. Karai even engages Leo to a sword fight where Leo tries to convince her that Splinter did not take the life of her mother. In "Wormquake," Leo tells her that Splinter is her real father, but she does not believe him. After the defeat of Tiger Claw, Raph then wonders where Karai is now while April still cannot believe that she is Splinter's very daughter. Splinter stated that one day Karai may indeed accept the truth, but that is her decision to make and hers alone. Unbeknownst to all of them, Karai is secretly hiding behind another billboard not too far away from them. She hears every single thing that they said. Judging by her several facial expressions, not only does she find herself in a difficult dilemma, but finally seems to start questioning herself. In "The Wrath of Tiger Claw", she begins to doubt that Shredder is her real father. When she looks at a picture of her mother, she hears the words Leo said to her from "Wormquake!/The Manhattan Project". When Shredder arrived, he asked her what was troubling her. Then, Karai asked him to know more truth about her mother and him, but Shredder has already know the "truth". Tiger Claw returns with a ripped right ear and eyepatch on his left eye and Shredder sends him and Karai to go after the Turtles again. Karai and Tiger Claw broke in Mr. Murakami's restaurant to ask him where the Turtles are. When Karai caught April, she didn't insist to fight her and wanted to tell something about April. When Leo and Donnie saw Karai with April, they both head to the girls. Karai tells Leo that she believes him about telling her that Splinter is her real father. Leo takes her to their lair to see Splinter, but Donnie knows Raph isn't going to believe this. When they arrived (with Casey knocked out after Tiger Claw threw him off a building), Raph is furious that they brought her to the lair. Karai told him that she didn't know that Shredder lied to her, which made Raph threaten to hurt her with his sai. While Leo and Raph continue arguing, Karai secretly uses a tracking device to have Tiger Claw locate where the Turtles are. She then encounters Splinter again, who shows her to the training room and revealing a picture of Splinter as a human with Tang Shen and a picture of them with Karai as a baby. Karai, feeling guilty, apologizes to him and the Turtles, but doesn't plan to stay because she signaled Tiger Claw, which Raph angrily claimed that he was right about Karai. Before she left, Splinter tells her that she is who she chooses to be, not what others make her. At a meat factory called "Patty Man's" (which was Mikey's idea), Tiger Claw fights the Turtles and let Karai to finish off Leo, but she turns on him. Tiger Claw then kidnaps her to take her to Shredder's lair with Leo watching in horror, but Raph still doesn't insist on helping her and Michelangelo is badly bruised. Then, Tiger Claw tells Shredder that Karai has betrayed him and was fighting alongside the Turtles. When Karai angrily asked Shredder if Splinter is her father, Shredder says yes, which makes Karai shocked that she was lied by Shredder her whole life. Shredder orders Tiger Claw to take her away. Karai is locked in a dungeon cell as Tiger Claw and Shredder leave, screaming in horror. Karai returns in "The Legend of the Kuro Kabuto", trying to escape from her cell while covering this up in front of a visiting Shredder. In "Vengeance is Mine," the Turtles succeed in rescuing Karai from the Shredder. When with Splinter, Karai learns from Splinter about the rivalries between the Hamato Clan and the Foot Clan. When Karai goes after Shredder herself, she ends up fighting Shredder who manages to overwhelm her. When in Stockman-Fly's lab, Shredder planned to use Karai as bait so that the Turtles can fall into the traps and be thrown into the mutagen vat filled with snake DNA. During the Turtles and Splinter's mission, Leonardo tried to rescue Karai until Shredder interfered. Because of this, Karai fell into the mutagen where she emerged as a white snake-like mutant with snake-headed hands (similar to Scale Tail from the 1987 toyline) much to the shock of Splinter and Shredder. Karai's mutated form ended up causing a fire in Stockman Fly's lab which caused both sides to retreat. In a twist ending, it is shown that Karai can change at will between her human and mutant form yet still has some snake traits in her eyes and fangs.
- Timothy / Pulverizer / Mutagen Man (voiced by Roger Craig Smith) - Timothy was an ineffective neighborhood doofus who eyewitnesses the Turtle's first battle with Baxter Stockman from his apartment window and, ever since then, deticates himself with fighting crime as a costumed vigilante calling himself the Pulverizer and models his appearance after the Turtles. In their first encounter with Pulverizer, the Turtles rescue him from a bungled attempt to stop the Purple Dragons from looting a warehouse. Pulverizer winds up back at the Turtles' lair after he accidentally gets stuck to the Shellraiser. Taking pity on the would-be hero, Donnie attempts to train Pulverizer in basic self-defense, but Pulverizer shows little capacity to learn. In a failed attempt to stop the Kraang from fleeing with their power cell, Pulverizer winds up in need of help, and Donnie chooses to save him instead of getting the power cell back. Pulverizer vows to train on his own in order to be better the next time he meets the Turtles. In "The Pulverizer Returns," Pulverizer is recruited into the Foot Clan (mainly to serve as a "cannon fodder") and he agrees to gather info on Shredder's plans for the Turtles, and later volunteers to be a test subject for a supply of stolen Kraang Mutagen. During the Turtles' rescue attempt, he attempts to activate the mutagen machine, although he is stopped multiple times by Donnie. However, he was successful on one attempt, causing the mutation to occur. Since he had not come into contact with anything animal or plant-related prior to volunteering, the Pulverizer is transformed into a huge mutant blob of mutagen with floating organs and a disintegrating touch that Mikey later on dubs "Mutagen Man" (becoming this series' interpretation of Mutagen Man). Timothy is rescued by the Turtles (who worked together to place Timothy in the empty mutagen container) and Donatello vows to find a way to restore Timothy back to normal. In "The Mutation Situation", Donatello and Metalhead are seen testing his organs. Again, he is seen briefly in "Invasion of the Squirrelanoids". In "Mutagen Man Unleashed," Donatello develops a voice box so that Mutagen Man can speak easily. Mutagen Man drinks some of the mutagen samples and gains the ability to form arms and legs outside of his container. In this form, Mutagen Man goes after April upon developing a crush on her. When Mutagen Man finds April, he ends up attacking Casey Jones who tries to fight back. April helps Casey to fight Mutagen Man as they escape on Casey's bicycle. As April and Casey get away, Mutagen Man is confronted by the Turtles where he is officially named by Michelangelo. Mutagen Man then starts to power down upon running out of mutagen. During the ride back to the lair, Mutagen Man drinks from a mutagen container and escapes from the Shellraiser and goes after April again. The Turtles manages to catch up to Mutagen Man near April's apartment. Using camouflage and misdirection that involves mutagen, the Turtles fool Mutagen Man where they end up freezing Mutagen Man with a retro-mutagen prototype that had similar affects of liquid nitrogen. Mutagen Man's frozen body is taken back to the lair as Donatello vows to continue finding a cure for him. He has been seen numerous times frozen in Donnie's lab in some episodes.
- Casey Jones (voiced by Josh Peck) - Casey Jones is a young student at April's School who got held back. He is missing his two front teeth, is usually dressed in black, and almost never goes anywhere without his hockey stick. When April was hired to tutor him for an extra credit assignment when they first met, Casey shows April his courtesy and the two quickly become friends, much to Donnie's jealousy. He shows admirable fighting skills, especially when he helps April fight Mutagen Man and an entire Foot Bot squad but eventually ends up defeating himself. In "The Good, the Bad, and the Casey Jones," Casey takes up a crime-fighting hobby following these recent incidents. He arms himself with hockey sticks, baseball bats, and a stunner in one of his hockey gloves. Casey ends up being introduced by April to the Ninja Turtles and Splinter when he follows Raph into their home. He also helps the Ninja Turtles when the Foot Bots invade their lair. Casey's worst fear is rats.
- Irma Langinstein (voiced by Kate Micucci) - Irma Langinstein is April O'Neil's friend. So far, it hasn't been known if Irma will find out who the Turtles are. She seems to be a lot more serious than her 1987 incarnation. In "Mousers Attack", she called April when her phone was stolen by the Purple Dragons. In "Mutagen Man Unleashed", she is shown as a background character, but her face is not seen. In "The Good, The Bad and Casey Jones", she makes her first introduction appearance with April and both discover the bruises on Casey's face. When Irma asked Casey how he got them, she makes a suspicious "Hmm?", though Casey seemed annoyed and angrily asked her if she's his interrogator. This made Irma upset and she tells April to leave for the exam and not be late. She makes a major role in "Of Rats and Men", where she had pizza with Casey and April. She seemed disappointed that the people claimed that pizza was gluten-free, but she claimed to have definitely tasted gluten. Casey thanks her for hanging with them on their "date", since they really needed a chaperone. When Casey got spooked by a rat, Irma laughed about someone as big as him for being scared of a small rat. April then spotted a stray cat (which became Ice Cream Kitty later), and decides to find it a home. Irma stated that rats are relatively harmless, and explaining they also share many human similarities, which is why they are used in scientific experiments. She doesn't intend to keep the cat, because she's more of a "rat person". She heard a strange noise behind her, but didn't seem to see anything watching. When April and Casey left with the cat, Irma was disappointed that they ditched her again. She says to herself that she'll one day find out where the two are always running off to, which possibly hints that she may encounter the Turtles in a future episode. Suddenly, a strange mutant (later revealed to be a giant rat), that has been spying on her, appears and roars, then Irma turns around and screams in horror as it seemingly attacks her! Later, it was discovered that Irma was captured (including Casey and several other people) by The Rat King's army of giant rats. The Rat King also decided to test his new serum on Irma after the previous mutagen serum was not perfected. However, the Turtles, Splinter and April (even Ice Cream Kitty) found him and April managed to release Casey, Irma and the citizens. When they head to the surface, one of the giant rats attacks April, Irma, and Casey; but the rat was taken out by Casey. In "Pizza Face", she insisted April to watch a scary movie with her, but April lies to her that she has a date with Casey, though Irma doesn't believe the "dating with Casey" excuse. She is also suspicious and wandering about her "secret friends" that she won't let her know, which may be a clue that she'll encounter the Turtles. Then, she and April accidentally got bumped into a pizza delivery guy, who exclaimed that he's being attacked (possibly by Pizza Face). April also left with a box of pizza the guy dropped, which made Irma upset that April left with no honest reason. In "The Wrath of Tiger Claw", Irma returns after watching a movie with April and Casey. When April sensed that they're being followed, they intended to split up. Once again, they left Irma, who is confused about what April was talking about.
- Jack J. Kurtzman (voiced by Robert Forster) - Jack J. Kurtzman was a private investigator and journalist investigating the disappearance of Kirby O'Neil, leading to him discovering the Kraang and investigating them on his own. Jack is only seen in his apartment where it is always dark. Displaying a book full of notes, Jack insists that the Kraang presence on Earth is "ancient" and actually goes back thousands of years. He first appears in "The Kraang Conspiracy" where he was taking pictures of the Turtles while they and April were out on a mission. The Turtles follow Jack to his apartment and he introduces himself to them. He explains that he has been investigating the Kraang. He shows them a picture of April as a baby and tells her and the Turtles that the Kraang have been attempting to terraform the Earth for thousands of years, but needed a "specific chain of human DNA". He tells her and the Turtles that April's mother was taken by the Kraang before she was born and used in their experiments. He also explained that with April's DNA, the Kraang could perfect the mutagen in this dimension. Eventually, the Kraang manage to find them. They retreat, but the Kraang followed them so they got away in the shellraiser. Afterwards, Jack tells them that they need to infiltrate TCRI in order to erase all of April's DNA codes. The Turtles succeed after the fight with the Kraang and the April clones and get away with Jack Kurtzman. Jack Kurtzman states that he'll be in touch. He returns in "The Manhattan Project" (aka "Wormquake!") when April and Donnie meet him about the Kraathatrogons. He has photos of the Kraathatrogons and calls the Kraang's scheme the Manhattan Project. Kurtzman reveals that the Kraathatrogons are only children, while the adults are huge, and some are hundreds of feet long. He shows that the Kraang bring them from Dimension X to take them to their machines in order to collect their mutagen, which is kind of like milking a giant cow, much to the two's disgust (mostly April). Kurtzman also explains that there isn't a clue to stop them, but he knows that the Kraang ride on them and to control the worms is by pulling the antennas like the reins on a horse, which April finds it to be gross.
- Ice Cream Kitty (voiced by Kevin Eastman) - April finds a stray cat in an alley and, deciding to find it a home, asked Mikey to watch over it and she became his pet. Upon the cat unknowingly eating mutagen and samples of Neapolitan Ice Cream, the cat became a cat/ice cream hybrid that Mikey dubs "Ice Cream Kitty" and hides her in the freezer while trying to keep the others from learning of this. Mikey later used Ice Cream Kitty to help fight The Rat King where Ice Cream Kitty broke Rat King's control over Splinter. Donnie tells Mikey that they will have a talk about the incident that caused Ice Cream Kitty's transformation later. In the episode "Mazes & Mutants," Ice Cream Kitty seems to be friends with Splinter, considering giving him a cheesesicle (a frozen treat, which consists of a slice of Swiss cheese on a popsicle stick). In "Newtralized!", Ice Cream Kitty makes another appearance when she gives Raph an ice pack for Casey's head. In "Pizza Face," she gives Mikey a cheesesicle so he can make pizza. She also attacked one of Pizza Face's minions when Mikey locked him in the freezer.
- Foot Clan - An evil ninja organization led by Shredder. Founded 1500 years ago in Japan by a dreaded ninja warrior known as Koga Takuza. Takuza, a swordsman with no equal, not only built the clan from scratch, but - from the stolen sacred totems of defeated adversaries - forged an alloy stronger than steel and fashioned it into a helmet known as the Kuro Kabuto. Their rival clan, the Hamato Clan, vanquished them in modern times, but the infant survivor of that battle, Oroku Saki, would one day resurrect the Foot Clan and take the Kabuto for himself and rechristen himself as The Shredder. Originally populated by only human members, the Foot had become a global network of ninja assassins. Members were trained and inducted from all forms of life, such as wealthy martial arts star Chris Bradford (Saki's prized student) and Brazilian street thief Xever. However, under Shredder's guidance, the clan has recently been focused only on the blood feud between him and adopted brother Hamato Yoshi (Splinter) once Saki learned of Yoshi alive in New York. That feud has had the consequence of both Bradford and Xever mutated into the creatures known as Dogpound (later Rahzar) and Fishface. With the aid of inventor Baxter Stockman, Shredder has increased his New York army with the creation of Foot Bots.
- Oroku Saki / Shredder (voiced by Kevin Michael Richardson) - Oroku Saki was a ninjutsu master and son to the leader of the Foot Clan, who was orphaned when the Hamato Clan ended their long conflict. Their leader, the father of Hamato Yoshi (Splinter), took Saki into his family, and together both he and Yoshi were raised as brothers, albeit intense competitors in their Ninjutsu training. However, when both men fell for the same woman, Tang Shen, their relationship deteriorated into a brutal rivalry. Tang Shen ultimately chose Yoshi, which left Saki consumed with undying hatred and jealousy. Upon learning of his true heritage, Saki resurrected the Foot and claimed the symbol of their sect, the Kuro Kabuto helmet, for himself under the code name "the Shredder". After the birth of Yoshi and Shen's daughter, Miwa, Shredder attacked the family in their home. During the fight, a fatal blow meant for Yoshi accidentally took the life of Tang Shen. Blaming Splinter for his own mistake, Shredder set their house on fire and left Yoshi for dead. That same fire disfigured part of Shredder's own face, henceforth forcing him to conceal it with the Kuro Kabuto. Years later, Shredder learns that Splinter is alive and in New York after noticing the Hamato crest imprinted on a shuriken during a television news report. Seeking to finish his business with Splinter, Shredder and his Foot Clan relocate to New York. The Turtles first encounter Shredder in "The Gauntlet", where he dominated them all in combat. Shredder almost kills Leonardo, but the distraction of the newly mutated Xever and Chris Bradford gave the Turtles the chance to escape. In the same episode, Shredder is shown to have a pet Akita named Hachiko. He is also Karai's adoptive father. In "The Alien Agenda", Shredder didn't believe in the Kraang until Karai brought him the robot body of one of the Kraangs. As Baxter Stockman gets to work on studying the technology, Shredder assigns Karai to learn more about the Kraang so that he can use whatever information is gathered about them in his war against the Turtles. In "Karai's Vendetta," Shredder interrogates a captured Kraang (even when Karai informs them on how they work their exo-skeletons) on why they have been hunting the Turtles and learns that they are protecting April O'Neil. Shredder ends up sending Karai to capture April in order to draw the Turtles to him. In "The Pulverizer Returns," Shredder decides to obtain mutagen so that he can transform some of the Foot Soldiers into mutants just like how Chris Bradford and Xever were mutated. After the Turtles thwarted the plot, the captive Kraang operative tells Shredder that they have a common enemy in the Turtles. In "Showdown" Pt. 1, April's capture leads to Master Splinter confronting Shredder at his base where Shredder sees that Splinter is a humanoid rat as they begin to fight. In "Showdown" Pt. 2, Shredder and Splinter continue their battle. During the course of the battle, Shredder reveals that to complete his revenge he actually took Splinter's daughter Miwa (who was revealed to have survived the fire,) renamed her Karai, and deceived her from infancy to believe that Splinter had been responsible for her mother's death. In "The Mutation Situation," Shredder orders some mutagen from the Kraang. After the mutagen canisters are scattered throughout the city, Shredder plans to build his army on his own. In "Follow the Leader," Shredder leaves for Japan to take care of an urgent matter where he tells Karai not to do any action towards the Turtles while he is away. In "Wormquake," Shredder brings Tiger Claw onto his team and makes him his second-in-command. In "The Wrath of Tiger Claw," Shredder sends Karai with Tiger Claw in order to find the Turtles. After Karai interfered in Tiger Claw's mission, she was brought to Shredder as she asks for the truth that Splinter is her real father. Shredder says yes and has Tiger Claw lock up Karai. In "The Legend of the Kuro Kabuto," Shredder visits Karai in her jail cell explaining why he kept her real father a secret and hopes that she will one day understand what he had to do. After Shredder's helmet called the Kuro Kabuto is stolen by Anton Zeck on Steranko's behalf, Shredder finds his calling card on a glued-down Rahzar and orders him to get him everyone. After explaining the history of the Kuro Kabuto, Shredder orders his minions to hunt for Anton Zeck where Fishface is sent with Stockman-Fly while Rahzar is sent with Tiger Claw. When Leonardo confronts Shredder for a trade, he kept him busy long enough for the others to get to Karai. Shredder managed to get the Kuro Kabuto back upon the Turtles' retreat. It later turned out to be a bomb as the Turtles evade it. In "Vengeance is Mine," Shredder did not want Tiger Claw to kill Karai when she got out. When Shredder wanted Karai to understand what he had to do, Karai told Shredder that he is not her father. After the Turtles freed Karai, Shredder states to Tiger Claw that Karai will want to have her revenge on him. When Karai arrives to get her revenge on Shredder, she ends up overwhelmed by Shredder who manages to defeat her. Shredder then plans to use Karai as bait so that he can have the Turtles fall into the mutagen vat filled with snake DNA that Stockman-Fly had placed in there. During Shredder's fight with Splinter, Shredder tried to stop Leonardo from freeing Karai only to cause her to fall into the mutagen vat and emerge as a snake-like mutant much to the dismay of Shredder and Splinter. Just as he had with Shen's death, Shredder blamed Splinter for Karai's mutation as the resulting battle ends up destroying Stockman-Fly's lab.
- Chris Bradford / Dogpound / Rahzar (voiced by Clancy Brown) - Chris Bradford was a famous martial artist who is also secretly a member of the Foot Clan, owning a chain of dojos across the country, which are used to train the Foot Soldiers. Bradford is ordered to pair up with Xever to find Splinter. After his first encounter with the Turtles, he befriends Michelangelo on a social media website in an attempt to entrap the Turtles, going so far as to teach Mikey his secret kata "The Death Dragon", which Bradford learned from Shredder. Bradford later captures Mikey and baits the Turtles to rescue him and lead the Foot to Splinter. However, the plan fails after Splinter recognizes the 'Death Dragon' move during the Turtles' sparring. Bradford is defeated by Mikey's use of the 'Death Dragon' before he and Xever are flushed down the sewers. In "The Gauntlet", Bradford and Xever go after the Turtles again and are exposed to mutagen when Bradford stabs the mutagen container part of the bomb on top of the Wolf Hotel which washes him and Xever off the building, transforming Bradford into truck-size mutant Akita with a spiked back, a large left arm, a right arm as hard as his spikes, heightened senses, and super-strength (with the mutation contributed by a previous bite in the hand from Shredder's pet Akita, Hachiko) that Mikey dubs "Dogpound". He also has a mustache. In "Showdown" Pt. 1, Dogpound reveals his own twisted knowledge of the Shredder-Splinter rivalry to Fishface, implicating Yoshi as the true instigator. Both he and Fishface are easily defeated by Splinter when he arrives to rescue April. In "Mikey Gets Shellacne," Dogpound goes after Baxter Stockman so that he can make him normal. During the fight at Baxter's lab, Dogpound falls into Baxter's mutagen tank during his fight with Michelangelo and emerges as a near-skeletal werewolf-like mutant stronger and more agile than Dogpound that Mikey dubs "Rahzar". Mikey tricks Rahzar into attacking the electric system as the sprinklers go off, electrifying Rahzar, Fishface, and Baxter Stockman. In "Wormquake," Shredder sees Bradford's Rahzar form and state he'd look different. During this episode, Rahzar demonstrated the ability to eject his bony parts at his opponents. Bradford makes another appearance in "The Lonely Mutation of Baxter Stockman", where he and Shredder confront Baxter of his miserable failure, and ended up having his mutagen collar explode, turning him into a mutant fly after a fly touched his nose. When Rahzar and Foot-bots arrived to see Baxter, the mutant fly quickly destroyed the Foot-bots and escaped. Later, when Shredder told Stockman-Fly to make one last mutant, Rahzar tossed a chocolate bar for Stockman to eat. In "The Legend of the Kuro Kabuto", he teamed up with Tiger Claw to get the Kuro Kabuto (Shredder's helmet). He reappears in "Vengeance is Mine", where he and Fishface were distracted by Michelangelo's shadow puppet skills. During the fight, he scratched Mikey on his left arm and in slow motion, the turtle shouted "TO...KKA!" Mikey then pushed him off the building as Rahzar falls in a pile of trash.
- Xever / Fishface (voiced by Christian Lanz) - Xever was a Brazilian street urchin who was abandoned by his parents and left to survive however he could by pickpoketing. As he grew older, his skills in thievery grew until he became a thug successful enough to break into other people's homes for their valuable property until he was finally caught by the authorities during one of his burglaries and imprisoned until Shredder, who the item he was caught stealing belonged to, freed him and indoctrinated him into the Foot Clan. Shredder orders this ruthless, accomplished fighter to assist Chris Bradford in finding Splinter. He has been paired up with Chris Bradford since Xever is familiar with the criminal underworld of Manhattan. During a battle in "The Gauntlet", Bradford and Xever go after the Turtles again and are exposed to mutagen when Bradford stabs the mutagen container part of the bomb on top of the Wolf Hotel which washes him and Xever off the building, transforming Xever into a enormous mutant snakehead with powerful stick-like arms venomous fangs that releases fever, nausea and hallucinations (with the mutation contributed by the previous hold of a snakehead at a Chinatown market stall) that Mikey later dubs "Fishface". After his transformation, Fishface lives in the waters within Shredder's hideout. In "The Alien Agenda", Baxter Stockman creates a water-breathing rig for Fishface and mechanical legs that Baxter tries to get working. In "The Pulverizer," Fishface gains full control of his robotic legs. During the battle, he bites Raph. In "Baxter's Gambit," Raphael learns more about Xever's past. In "Showdown" Pt. 1, Dogpound and Fishface fight Splinter when he arrives to rescue April. He is defeated by Splinter and gets knocked into the water when Shredder arrives to fight Splinter. In "Mikey Gets Shellacne", he and Dogpound both take orders from Karai and kidnap Baxter Stockman to turn the two back into humans. However, Fishface witnessed Dogpound transforming into a skeleton-looking werewolf after he fell into Baxter's tank of mutagen, and Mikey dubs him "Rahzar". Then, Fishface, Rahzar, and Baxter all get electrocuted when Rahzar accidentally hits the electric system and the sprinklers go off. In "Wormquake!", he seems to be a little scared when Tiger Claw showed up (presumably because a tiger's diet includes fish), and offered him some refreshments. When he faced Raph again, he reveals his new weapon is a larger butterfly knife called a switch saber. In "The Legend of the Kuro Kabuto", he teamed up with Stockman-Fly to get Shredder's helmet (the Kuro Kabuto). In "Vengeance is Mine", he is seen giving Karai awful prison food. Later, he and Rahzar were distracted by Michelangelo's shadow puppet skills. Then he, Tiger Claw and some Foot-Bots chased the Turtles and Karai, but Fishface was unable to catch up after Donnie poured pizza grease on the street to make his motorcycle slip.
- Tiger Claw (voiced by Eric Bauza) - Tiger Claw was a Japanese circus performer was mutated into a very tall humanoid mutant Bengal tiger as a child. As he grew older, he eventually became part of the criminal underworld when he was trained by Shredder as his bounty hunter and a master of all weapons, collecting them from most warriors he defeats. He lost his tail in battle against a rival and searches for the person who took it so that he can make that person pay dearly. In "Wormquake", Shredder brings him in as his second-in-command and sends him and Karai into attacking the Turtles in order to draw out Splinter. After Raph and Mikey were defeated by Tiger Claw, Leo ends up calling Splinter on the Cheese Phone for help. Splinter arrives where he fights Tiger Claw. During the fight, Karai hit Splinter with a dart that had a weakening poison on it enabling Tiger Claw to knock Splinter down and capture him. When Shredder plans to finish off Splinter, Tiger Claw showed his sense of honor by granting Splinter a final showdown with Shredder. Leo, Raph, and Mikey were able to rescue Splinter and get him to a safe spot. While Leo, Raph, and Mikey were fighting Tiger Claw, Karai, Rahzar, and Fishface, Splinter recovered from the poison and joined the fight. During the battle, April and Casey emerge on a Kraathatrogon where it swallowed Tiger Claw upon his jet pack malfunctioning. In "The Wrath of Tiger Claw", Tiger Claw returns with a torn right ear and an eyepatch on his left eye. He reunites with Shredder and Karai where he traveled through different worlds after escaping the Kraathatrogon and fighting through the Kraang. Shredder sends Karai to go with Tiger Claw to destroy the Ninja Turtles. During their mission, Tiger Claw states that Karai was assigned to this mission because she knows where the Turtles hangs. out. Karai and Tiger Claw attack Mr. Murakami's restaurant where they get info on where to find April and Casey. While Karai goes after April, Tiger Claw goes after Casey. Casey worked to evade Tiger Claw's attack where Casey thinks that Tiger Claw is still mad about "the worm thing." He then throws Casey off the building. Tiger Claw later traces Karai to the Turtles' sewer lair and starts to head there, but the Turtles and Karai end up luring Tiger Claw to a meat locker of a factory where the Turtles end up fighting Tiger Claw. When Karai arrives, she attacks Tiger Claw, but he knocks her out. Tiger Claw then leaves with Karai and informs her actions to Shredder. After Shredder confirms to Karai that Splinter is her true father, he has Tiger Claw lock Karai up. In "The Legend of the Kuro Kabuto", he teamed up with Rahzar to get Shredder's helmet (the Kuro Kabuto). He reappears in "Vengeance is Mine", where he caught Karai from escaping and has her shackled and locked up in another cell. When Raph and Leo rescue her, Tiger Claw attacks them, but only to be temporarily stunned by the dog whistle that Donnie set up. He chased them to capture Karai, but only to get knocked off the Shellraiser. Later, Shredder has him to get in touch with Stockman-Fly. Once Karai was captured, Tiger Claw gags her with tape and they hang her above Stockman-Fly mutagen tank to lure the Turtles and Splinter. However, everything went wrong when Karai got mutated, and Stockman-Fly's lab caught on fire. Tiger Claw then told his leader to retreat with him or the whole lab will go down with him. He told Shredder that he won, though Shredder feels that he hasn't won with Karai as a mutant.
- Anton Zeck / Bebop (voiced by J.B. Smoove) - Anton Zeck is a master thief armed with high tech gadgets and wears a high-tech suit that has an energy mohawk. He was hired by Steranko to steal Shredder's helmet called the Kuro Kabuto. It was also mentioned that Anton once caused an accident that gave Steranko his diamond eye. Following his theft where he left his calling card on a glued-down Rahzar, Anton ran into the Turtles who stole the Kuro Kabuto from him. He did had to fight the Turtles, Rahzar, Fishface, Tiger Claw, and Stockman-Fly over the Kuro Kabuto where he managed to evade them. When Anton Zeck had met up with Steranko in his helicopter, they discover that Leonardo had swapped it out with dirty diapers at the last minute. Steranko vowed to hurt Anton Zeck for this. In a later episode, Anton Zeck will mutate into a mutant warthog.
- Rocksteady - Rocksteady is a mutant black rhinoceros.
- Foot Soldiers - The Foot Soldiers are ninjas loyal to Shredder and make up the soldiers of the Foot Clan. The Foot Soldiers wear black suits and masks. The masks appear to have bug-like eyes and have the Foot Clan logo on it (similar to the outfits worn by the Foot Ninjas from the Teenage Mutant Ninja Turtles films). The Foot Soldiers seem to never talk. Each of the Foot Soldiers fight with staffs, shurikens, katanas, Naginata, Tonfa, and nunchucks. The Foot Soldiers recruits are trained at Chris Bradford's dojos. At the time when Shredder was in Japan, the Foot Soldiers haven't been seen since the Foot Bots came into view.
- Foot Bots - The Foot Bots are robotic Foot Soldiers that were created by the Kraang to strengthen the Foot Clan. The Foot Bots can adapt to every ninja moves and skills. During the Turtles' fight with the Foot Bots, the Turtles had to do unpredictable moves and skills to defeat them. In "Target: April O'Neal," the Foot Bots get upgraded with two extra retractable arms where each of them have weapons protruding from where the hands would be. They learned how to ice skate among other things as seen when they face off against Casey Jones at the ice skating rink. In "The Lonely Mutation of Baxter Stockman," the Foot Bots are shown to have gliding abilities where they have retractable fabric wings.
- The Kraang (voiced by Nolan North) - The Kraang are a race of brain-shaped aliens from Dimension X that pilot robotic bodies called Kraangdroids and are responsible for bringing mutagen to Earth. The Kraang have not mastered English and communicate in redundant speech. In "The Gauntlet," the Turtles learn that the Kraang have been abducting scientists so that they can help modify the mutagen's properties. In "The Alien Agenda," the Kraang establish the World Wide Genome Project as a front while they were collecting the DNA of every animal and plant species on Earth. In "The Pulverizer," the Kraang reclaim the power cell that Leatherhead stole from them. In "TCRI," it is revealed that the Kraang have their headquarters in the higher parts of the TCRI building. It is also revealed that the Kraang can also survive in poisonous gas. While inside the TCRI building, the Turtles discover the Kraang's invasion plan: to mutate the whole planet so that their kind can live here, which will wipe out everyone else in the process. When the Turtles manage to get away when their explosives are unable to destroy the Kraang's portal, Michelangelo managed to obtain a Kraang data storage device which revealed that the Kraang are also after April. In "Cockroach Terminator," the Kraang steal a special lens as part of a plot to use their laser drill to burrow to the Earth's core as part of the Kraang's invasion plan. This plot was thwarted by the Turtles. In "Enemy of My Enemy," two Kraang operatives pilot a spacecraft when hunting the Turtles up to the point where they end up crashing a weapons trade involving the Shredder. The spacecraft was repelled by the Turtles. In "Karai's Vendetta," a captured Kraang is interrogated by Shredder on why they hunt the Turtles and learns on how they've been targeting April. The Kraang set up a base in the East River where they have started a plot to turn Earth's water into Kraang water and have brought a large unnamed sea monster from Dimension X to help guard the base. The Turtles managed to destroy the base and escape from the sea monster. In "The Pulverizer Returns," the captive Kraang agent tells Shredder that the mutagen that had mutated Chris Bradford and Xever into Dogpound and Fishface has unpredictable results on Earth. After Shredder's mutagen plot was thwarted by the Turtles, the captive Kraang agent tells Shredder that they have a common enemy in the Turtles which led to an alliance between the Foot Clan and the Kraang. In "Showdown" Pt. 1, the Kraang begin their invasion by bringing the Technodrome to Earth. Even though the Ninja Turtles destroyed the portal, the Technodrome and Kraang Prime had already arrived. In "Showdown" Pt. 2, the Kraang start to collect human specimens for Kraang while Kraang Prime begins to siphon the mental energy from April. This plot was thwarted by the Turtles. In "Plan 10," the Kraang develop a mind-swapping device in order to swap the minds of anyone which resulted in Raphael and a Kraang operative getting their minds switch. After the mind-swap is undone, the Turtles destroy the device. It is also revealed that the Kraang are going to invade Earth with a lot of Kraang soldiers.
- Kraang Prime (voiced by Roseanne Barr) - The leader of the Kraang. Kraang Prime is a brain-shaped alien. When Kraang Prime speaks to other Kraang, it uses redundant speech, but when speaking to anyone else, it uses normal speech. It first appeared in "Showdown" Pt. 1 where it tells the rest of the Kraang that the invasion of Earth should begin now as the Technodrome will appear in six hours. Kraang Prime arrives on Earth in the Technodrome. In "Showdown" Pt. 2, Kraang Prime confronts April O'Neil after she has been captured, who states that she has the mental energy needed to transform the Earth so that the Kraang can live on it. Kraang Prime then proceeds to begin siphoning the mental energy from April. As soon as Kraang Prime obtains enough of the mental energy, Kraang Prime begins its plot to mutate the Earth. The Turtles arrive to fight Kraang Prime which thwarted the Earth mutation plot. Kraang Prime then emerges in a giant robotic body and chases after the Turtles. Leo manages to hold off Kraang Prime while the others get away. Luckily, Leo managed to escape with the captive humans as the Technodrome falls into the ocean. In "The Kraang Conspiracy", Kraang Prime is seen in a hologram without his robotic suit and is telling the Kraang about his plan with the mutagen. He also caught April spying on him. He appears again in "Plan 10", where he is telling two Kraang about swapping minds with humans and invasion. He also became suspicious about one of the Kraang (which has Raph's mind swapped into it) being a little strange. Kraang Prime also states to the Kraang operatives that he has a lot of Kraang soldiers ready for the next invasion.
- Mrs. Campbell (voiced by Cassandra Peterson) - A research scientist from the World Wide Genome Project who takes an interest in April O'Neil. She is actually an android created by the Kraang who used the World Wide Genome Project as their front. When she was pursuing April, she ends up fighting the Turtles until her face is sliced off and is then shorted out by water from a nearby water fountain. Another robot of Mrs. Campbell was seen as the receptionist at TCRI. This time, she and the Kraang operatives were taken out by Leatherhead. Another Mrs. Campbell makes an appearance in "Showdown, Part 1", where she and the Kraang are taken out by Metalhead at TCRI. Another Mrs. Campbell an appearance in "The Kraang Conspiracy", where she attacked the Turtles and allowing one of the Kraangdroids to capture April. She was defeated when Raphael threw one of his sais at one of her missile-launching elbows, causing her to explode.
- Biotroid - The Biotroid is a Yeti/gorilla-type bio-mechanical suit that can be piloted by a Kraang. The Biotroid has powerful arms. It also has blades that are on its nipples and butt cannons, making it a very awkward villain. The Biotroid was first used on the Kraang stealth ship to protect the shipment of mutagen from the Turtles, with the resulting battle causing the mutagen canisters to fall onto the streets, one of which caused Kirby to mutate when he tried to protect April from the mutagen. The Biotroid was defeated by the Turtles and the stealth ship is redirected towards the moon. More Biotroids appeared in "Wormquake" where two of them were piloted by the Kraang to attack Donatello, April, and Casey during their investigation on a portal to Dimension X.
- Kraang Officer - A Kraang with a robotic left eye and a huge scar that will be introduced near the end of Season 2.
- Purple Dragons - A street gang that has been extorting shop owners for protection money. They have become allies with the Foot Clan. The Purple Dragons are commanded by Rahzar and Fishface.
- Fong (voiced by Andrew Kishino) - The leader of the Purple Dragons (unless Rahzar and/or Fishface is present) who fights with a butcher knife. Staff writer Kenny Byerly named Fong after Benson Fong, an Asian actor from the '60s who appeared in such films as The Love Bug and Flower Drum Song.
- Sid (voiced by Andrew Kishino) - A member of the Purple Dragons. Sid fights with an axe. Sid was named by show writer Jeremy Shipp.
- Tsoi (voiced by James Sie) - A Member of the Purple Dragons. Tsoi fights with a sledgehammer. He is named after Andrea Tsoi, a friend of show writer Kenny Byerly's.
- Baxter Stockman / Stockman-Fly (voiced by Phil LaMarr) - Baxter Stockman was a child prodigy who tried proving his brilliance at a science fair at school while presenting a volcano with real lava, which ended up burning down the gym and getting him expelled. As he grew older, he got a job as an inventor at TCRI, but was fired from the company for spilling copier toner and, ever since, plotted revenge against those who turned his "brilliance" down. The Turtles mispronounce his name, which annoys him. The Turtles first encounter Stockman in rudimentary battle armor, while he attempts to break into a building. The Turtles defeat him, but Stockman obtains Donatello's T-Pod, which contains a military-grade artificial intelligence chip, and incorporates it into his battle armor. The next time the Turtles run into Stockman, his battle armor has upgraded itself. Eventually, the Stockman battle armor and the T-Pod merge into a destructive robotic being, which Mikey dubs "The StockmanPod". The StockmanPod defeats the Turtles, causing them to flee. Using wisdom from Splinter about "fighting the person inside the armor", the Turtles engage the StockmanPod again, and make use of a beehive to cause the StockmanPod to fall off a building. The Turtles deactivate the T-Pod and throw Stockman in the dumpster again. Following the incident with the MOUSERS, Dogpound brings Stockman to Shredder. Shredder threatened to kill Stockman for interfering with his plan to kill the Turtles, but spares him and comments on how his intelligence could be useful. In "The Alien Agenda", Baxter creates a water-breathing rig and his prototype mechanical legs for Fishface. After Karai returned to Shredder's hideout with the Kraang body and the controls to it, Baxter Stockman gets to work on studying the machine so that he can get Fishface's mechanical legs operational. In "The Pulverizer," Baxter Stockman gets the technology that he uses to successfully get Fishface's mechanical legs operational. In "Baxter's Gambit," Baxter Stockman tells Shredder of his full-proof plan. This plan secretly has him planning revenge on the Turtles (who have been foiling his plans), as well as Dogpound and Fishface (who have been abusing and threatening him), where he traps them in the Maze of Doom. During this time, it was revealed that Baxter Stockman was once expelled from school after he made a volcano project that contained real lava, which burned down the whole gym. When the Turtles, Dogpound, and Fishface make it to the end of the Maze of Doom, Baxter Stockman unleashes a giant robot called the Monster of Doom upon them. After the Monster of Doom is destroyed, Baxter Stockman uses his helicopter hat to get away from Dogpound, Fishface and the Turtles. In "Mikey Gets Shellacne", Baxter Stockman sets up a headquarters in the remains of TCRI so he can use the mutagen to start his own mutant army. The Turtles find him while looking for a molecular centrifuge. As Baxter Stockman unleashes the MOUSERS to attack the Turtles, Dogpound also arrives. Dogpound manages to catch Baxter Stockman and the molecular centrifuge. Upon Dogpound seeing some mutagen tanks in Baxter's lab, Baxter states that he has been planning to make his own army of mutants. Upon Baxter claiming that he can make Dogpound and Fishface normal, Dogpound places a mutagen collar around Baxter's neck as part of his "insurance." Baxter's project is crashed by Mikey. When Mikey tricks Rahzar (Dogpound's secondary mutated form after falling into the mutagen tank) into attacking the electric box, Baxter Stockman, Rahzar, and Fishface are shocked when the sprinklers are activated. By the time Baxter wakes up, Karai has arrived at his lab where she tells him that he works for her and Shredder again. In "The Lonely Mutation of Baxter Stockman," Baxter Stockman is visited by Shredder and Rahzar about his failure to make a mutant army with his latest duck experiment. When Stockman states an idea to experiment on pigs and rhinos, Shredder ends up activating the mutagen collar on him. the mutagen collar explodes, transforming him Stockman into a humanoid mutant housefly with a lobster's black claw for a right hand and a verticle mouth that spits slime (with the mutation contributed by the sting in the nose from a housefly that was flying around the lab) that dubs himself "Stockman-Fly", collecting cravings for sugary products and spitting out slime before consumption. He plans to make himself normal by obtaining human DNA. Shutting off the power to his lab, Stockman-Fly evades Rahzar and escapes. Baxter Fly interferes with the Ninja Turtles' plans to test the retro-mutagen prototype on Kirby O'Neil's mutated form. After the retro-mutagen falls on to a car, Stockman Fly captures April in order to get more retro-mutagen or else April will be mutated at his lab. Stockman-Fly brings April to his lab where tries to fight him to no avail. Stockman-Fly then suspends April over the mutagen as a way to combine with her and become one. Leonardo, Donatello, and Casey Jones work to fight Stockman-Fly and free April. Rahzar joins the battle in order to claim the retro-mutagen. Stockman-Fly then competes with the Foot Bots sent by Rahzar in order to get to the mutagen first. Stockman-Fly swipes the retro-mutagen from the Ninja Turtles causing the Ninja Turtles to go after them while competing with the Foot-Bots. With help from Kirby-Bat, April O'Neil pursues them and manages to restore Kirby O'Neil to normal. Stockman-Fly is brought to Shredder where he wants him to make one more mutant for him as Rahzar tosses a chocolate bar to Stockman-Fly. Baxter then sarcastically thanks Shredder for his generosity before proceeding to eat the chocolate bar. In "The Legend of the Kuro Kabuto", Stockman-Fly returns to be partnered with Fishface to get Shredder's mask (the Kuro Kabuto). In "Vengeance is Mine," Stockman-Fly assists Shredder in using Karai has bait so that Shredder can have the Turtles fall into the mutagen vat filled with snake DNA. This didn't go as planned for not only did Stockman-Fly (who was startled by Shredder) allow two chemicals to accidentally mix together (which he still adds to the vat), but Karai herself fell into the mutagen vat as well. The resulting fight ended up setting Stockman-Fly's lab on fire.
- MOUSERS - An acronym for Mobile Offensive Underground Search Excavation and Retrieval Sentries, the MOUSERS are small robots that were created by Baxter Stockman to steal on his behalf. Stockman programs them to attack anything tagged with his radioisotope spray. The MOUSERS will attack anyone, including Baxter Stockman himself. In "Showdown" Pt. 1, Shredder and Karai use two MOUSERS so that Splinter can receive Shredder's message to come out and challenge him.
- Monster of Doom - An upgraded version of the StockmanPod that was created by Baxter Stockman. It was used by Baxter Stockman in his revenge on the Turtles, Dogpound, and Fishface. It took the combined strategies of both groups to defeat the Monster of Doom.
- Snake / Snakeweed (voiced by Danny Jacobs) - Snake was a thug working for the Kraang as their getaway driver who the Turtles interrogate to find out where the Kraang are holding April and Kirby O'Neil. During their mission to rescue the O'Neils, the Turtles crash a truck full of mutagen into the Kraang base, transforming Snake into a giant regenerating mutant weed with a hundred leaf-handed vines for arms, a hole in its neck showing the heart and a stem that splits in half to use as legs (with the mutation contributed by the fall off balance into a field of weeds) that Mikey dubs "Snakeweed". While the rest of the Turtles fight Snakeweed, Leo lures him into a power core where Snakeweed is electrocuted and blown up. After the Turtles leave, Snakeweed's heart starts beating again. In "New Girl In Town" he returns and is abducting people to use them as fertilizer. At the end of the episode, the Turtles fight him again. He is eventually frozen and shattered into pieces, but his heart starts beating once again. In "Metalhead Rewired," Snakeweed was among the mutants captured by Kraang in order for them to control them. He was first discovered in his cell by the Turtles, then he and Spider Bytez were released by the Kraang to attack the Turtles. Luckily, Metalhead freed them from the Kraang's control, attacking the Kraang, but having no intentions of harming the Turtles. Snakeweed then briefly aided the Turtles before making his way to escape. With help from Metalhead, the Turtles freed the captive mutants and they escape through the portal.
- Vic / Spider Bytez (voiced by Lewis Black) - Vic was a crabby New Yorker in his 40s who videotapes the Turtles on his cellphone during a rooftop battle with the Kraang after one of the Turtles accidentally knocked down his satellite dish. He calls the turtles "Kung Fu Frogs", Vic also insulted Raph, which caused him to lose his temper. When Vic attempts to sell his video to the Kraang, they kidnap him. Leo, Mikey and Donnie attempt to rescue Vic, who is splashed with some mutagen, transforming him into a humongous mutant black widow spider with a round body, agile arachnid legs for hair and a huge fanged mouth that spits digestive acid (with the mutation contributed by a bite in the finger from a black widow spider that crawled onto his phone) that Mikey dubs "Spider Bytez". Spider Bytez blames the Turtles for his mutation, and attacks them with his acidic spit. During the battle, Spider Bytez' cellphone is destroyed. Just when Spider Bytez has the advantage, Raph shows up and gains control over his temper. Spider Bytez escapes, vowing to get revenge on the Turtles later. In "Metalhead Rewired," Spider Bytez was among the mutants captured by Kraang in order for them to control them. He was first seen in the sewers, being chased by the Kraang, and begging for the Turtles to help him. The Kraang managed to capture him, then they lock him in a chamber and brainwash him. Then, Spider Bytez and Snakeweed were released to destroy the Turtles, but Metalhead freed them. Spider Bytez was last seen with Pete and Slash as they head for the portal. With help from Metalhead, the Turtles freed the captive mutants and they escape through the portal. In "Pizza Face", Mikey encounters one of the brainwashed citizens, who resembles Spider Bytez's human form.
- Dr. Victor Falco / Rat King (voiced by Jeffrey Combs) - Dr. Victor Falco was a scientist presumably working for the Kraang on an experiment involving a combination of mutagen and monkey DNA. Believing that he was close to developing a neurochemical that could make him psychic, Falco tests the chemical on his colleague Dr. Tyler Rockwell, transforming him into a man/monkey monster who can read emotions. After the Turtles figure out that Falco was lying about Rockwell's involvement in the research, they confront him. Falco injects himself with the chemical, which gives him the ability to predict the Turtles' every move. Donatello figures out how to close off his mind from Falco to defeat him. Falco escapes before the Turtles can interrogate him about the Kraang's plot. In "I, Monster", Falco is destitute but has salvaged some mutagen and has recreated the psychic chemical in his rat-infested lab. An accident with the chemical makes his body into a corpse-like state as well as gives him psychic control over rats, who help him out of the rubble caused by the explosion. While taking over all the rats in the city including Splinter, Falco dubs himself the "Rat King" and attempts to take over New York with his legion of rats. He manipulates Splinter into fighting the Turtles, but Splinter frees himself from mind control and defeats the Rat King. Rat King's rats then swarm over Rat King's unconscious body to get him away from the Turtles. In "Of Rats and Men," the Rat King resurfaces and has his giant rats attack Manhattan while trying to control Splinter again. The Rat King does peer into Splinter's mind to get what he needs. The Turtles end up fighting the Giant Rats as they are abducting humans with one of them being Irma. In The Rat King's lair, Rat King tells the captives that he created the Giant Rats from the Mutagenic Growth Serum so that he can use the mutagen to turn the captive humans into Rat People. Though The Rat King has had some failed experiments in the past. When The Rat King plans to make Irma his first subject, the Turtles and Splinter fight The Rat King while April tries to free the captive humans. Michelangelo throws the Ice Cream Kitty at The Rat King breaking his control over Splinter. While Splinter faces The Rat King, the Turtles face the giant rats. Splinter engages The Rat King further underground where he knocks Aristotle off of The Rat King's shoulder and then kicks The Rat King into the pit. In "Mazes & Mutants," there is a skeleton (or more) that has decaying looking teeth and messy hair which resembles The Rat King's skeleton in Sir Malachi's illusions.
- Aristotle - Rat King's pet white rat. At the end of "Of Rats and Men", Splinter managed to knock Aristotle off of The Rat King's shoulder as the rat falls into a chasm. It is unknown if Aristotle survived, but it is likely (depending on how high he was), since a rat can fall as far as 50 feet and land uninjured.
- Caligula - A giant rat who serves as Rat King's mode of transportation.
- Rat Man Freak (voiced by Jason Biggs) - A mutant humanoid rat who just appears in the episode "Of Rats and Men". When the Rat King was planning to turn the humans into rat people with his Mutagenic Growth Serum, Aristotle told him that the serum's not perfected. Then, both the Rat King and Aristotle witness the man he tested on turned into a hideous, disabled monstrosity. His only line was "Cheese! Please give me CHEESE!" His name is not mentioned in the show, but comes from the credits.
- Claudius, Nero, and Commodus - The other giant rats that are named.
- Justin - After Karai pushes a control button on a machine at the World Wide Genome Project, a variety of animal DNA samples (examples being the DNA of a jellyfish, an isopoda, an octopus, a cobra, and a cat) gathered by the Kraang are dumped into the mutagen resulting in the creation of a composite monster that Mikey simply names Justin (he was originally going to call him "Octo-Eyeball-Jelly-Bug"). After Karai leaves, Justin attacks the Kraang until only the Turtles are left. Leo manages to use his katanas as a conductor of electricity to destroy Justin. In "Metalhead Rewired", Justin turned up alive and was among the mutants captured by the Kraang in order for them to control them. It is seen briefly with Spyroach when he escaped his chamber. He was shot down by a Kraangdroid as he falls several feet, but he managed to survive and escape. With help from Metalhead, the Turtles freed the captive mutants and they escape through the portal.
- Traag - Traag is a 20 ft lava-spewing, rock monster with regenerating abilities, who is in service to the Kraang. The Kraang bring the giant through a portal that connects TCRI to Dimension X. Traag proves a challenge to the Turtles, but Leatherhead ends up dragging Traag through the portal back to Dimension X. In "Showdown," Traag was seen guarding the portal again where the portal has a force field around it. When the Turtles try to destroy it, they draw the attention of Traag and the Kraang. Leo uses the laser to disintegrate Traag.
- Dimension X Sea Monster - An unnamed alien sea creature from Dimension X that resembles the Loch Ness Monster. It first appears in "Karai's Vendetta" where the Kraang brought it from Dimension X according to Donnie. The sea monster was guarding the Kraang's underwater base where they turn earth's water into "Kraang water". When the Turtles (in the Turtle Sub) encountered it, they were able to outsmart it and get in the underwater base. It later attacked the Turtles in the underwater base and Mikey seemingly defeats it, while Donnie uses a Kraang laser gun to set an explosion to destroy the base. However, when all four Turtles got in their sub, the sea monster somehow managed to survive the explosion and chases the Turtle Sub. It then hits the sub to make it stop as the Turtles watch in horror when they believe they're about to meet their demise as the beast grabs their sub. However, the sea monster begins to make happy whale sounds where it thinks the Turtles Sub is a female of its own kind and has fallen in love with it! The Turtles were really disturbed and disgusted by this with the sea monster latching on the sub. This causes Mikey to comment on it and Leo (with a disturbed face) pulls a lever and sets some explosive charges on the sea monster to force it to release them. As the Turtle Sub leaves, the sea monster is left heartbroken. The sea monster returns in "Plan 10", where the Turtles, April and Casey (including a Kraang that is trapped in Raph's body) encounter it again. The monster again recognizes the Turtle Sub as a female of its own kind. It wanted to give trash for the sub to 'eat'. When the Turtle Sub passed, the sea monster becomes sad again and follows. When the Turtle Sub launched a torpedo to distract it, it accidentally hit the sea monster angering it. It then attacked the sub for hurting it. Donnie gets its tongue caught in one of the engines, causing the sea monster to pull its tongue out and swim away with sadness.
- April Derp (voiced by Mae Whitman) - A reject clone of April O'Neil who only appears in "The Kraang Conspiracy". Unlike most of the clones, she is very large, her right leg and left arm are terribly deformed, a large mouth on her back, and a small head on the side of her left eye that resembles the real April. The Kraang sends her to attack the Turtles, but she gets killed by the real April's psychic powers.
- Spyroach - Spyroach was a cockroach that was trained by Donnie to spy on the Kraang with special micro-equipment on it. Raph has a fear of cockroaches. An accident on Donnie's part that happened while it was spying on the Kraang caused Spyroach to fall into the mutagen and mutate into the Cockroach Terminator - a humanoid cockroach with the equipment fused to its body. After escaping from the Kraang base, Spyroach ran into the Turtles and attacked them. Raph was able to use the Shellraiser's cannon to knock out Spyroach, yet Spyroach managed to sneak away behind the Turtles's back. When the Turtles thwart the Kraang's robbery of the special lens, Spyroach catches up to the group where Spyroach defeats the Kraang. Then Spyroach attacks Raph until Leo saves him. The Turtles then use the bug spray in order to get it out into the street where it gets hit by a truck and collides with the wall. Yet Spyroach survives and goes after the Turtles. Leo discovers that Spyroach is targeting Raph and chased him until he got caught in the wet cement. It is then discovered that Spyroach had molted its skin and emerges in a second form where it can now fly. Spyroach then chases after Raph while the Turtles are trying to get to the Kraang. When Spyroach grabs Mikey, Raph ends up having to overcome his fear to rescue Mikey. Raph then pilots his vehicle to lure Spyroach away so that the other Turtles can stop the Kraang. Raph's fight with Spyroach ends up disrupting the Kraang's laser drill. Raph then turns the laser drill on Spyroach, who ends up blasted apart. Although a new Spyroach starts to form from one of the fragments of the old Spyroach or it could be the head of the original Spyroach that has signs of life. In "Fungus Humungous", he appeared as a hallucination (as a larger version of his normal form) as Raph's fear, which are, of course, cockroaches. In "Metalhead Rewired", a Spyroach was among the mutants captured by the Kraang in order for them to control them. He is seen briefly with Justin as they both escape their chambers. He was also in his final form during his escape. With help from Metalhead, the Turtles freed the captive mutants and escape through the portal.
- Steranko (voiced by Fred Tatasciore) - Steranko is a Russian arms dealer with a diamond eye who is an old friend of Shredder's. He first appeared in "Enemy of My Enemy", where he meets with Shredder for a weapons deal. During the Turtles' fight with Shredder, Steranko was knocked out by the weapon that was being sold to the Shredder. Steranko's name was revealed in the credits. In "The Legend of the Kuro Kabuto," Steranko sends Anton Zeck to steal Shredder's helmet, the Kuro Kabuto, to add to his collection. It was also revealed that Zeck was responsible for the accident that caused Steranko to have a diamond eye. When Zeck had met up with Steranko in his helicopter, they discover that Leo had swapped it out with dirty diapers. Steranko vowed to hurt Zeck for this.
- Parasitica Wasp - A giant mutant parasitoid wasp that hypnotizes the Turtles into protecting its egg by stinging them (the hypnotized victims infect their enemies by biting them). They nearly possessed the Turtles until they were broken free by Mikey and destroyed by the Turtles. Also, it showed that when the wasp stung Leo, it died after having lost its stinger, however, real wasps do not die after stinging their enemies, and therefore they do not lose their stingers since they're not barbed. In "Metalhead Rewired," at least two Parasitica Wasps were among the mutants captured by Kraang in order for them to control them. The first one was seen with a Squirrelanoid, Kirby Bat, and Spyroach when they discovered that Metalhead opened their cells and the portal. Another wasp was seen shortly with a Squirrelanoid and Pete as they head for the portal. The other wasp was not able to escape as it got knocked out of the air when the portal closed and crashed on the ground. With help from Metalhead, the Turtles freed the captive mutants and they escape through the portal.
- Newtralizer (voiced by Danny Trejo) - Newtralizer is a tall mutant fire-belly newt with high-tech armor and weapons. It was result of the Kraang's experiments with the mutagen where it was considered dangerous to them. The Newtralizer takes on the Turtles when Donnie accidentally releases it from Kraang detention cell during the second attempt to rescue Kirby O'Neil. It is a carnivorous creature that eats Kraang. Mikey drives a car on top of the Newtralizer, crushing it and allowing them to escape. The Newtralizer is shown to have survived after the Turtles leave. In "Metalhead Rewired", Newtralizer was among one of the mutants captured by the Kraang in order for them to control them. He is seen briefly in a background when Slash punched one of the Kraangdroids as Newtralizer, Rockwell, and a Squirrelanoid escape their chambers. He also didn't have his gear, though he may have reclaimed it before heading to the portal. With help from Metalhead, the Turtles freed the captive mutants and they escape through the portal. In "Newtralized," Newtralizer freed Slash from the Kraang and they worked to stop the Kraang's plots and even stole some plutonium for their teleporter devices. During this episode, it is shown that a part of Newtralizer's armor had a program that enabled him to speak human language. When it came to Newtralizer's collaboration with Slash, it is shown that Newtralizer doesn't care for the humans when it comes to stopping the Kraang. During a fight with the Kraang at the docks, Newtralizer hijacked the Kraang Walker and used it to attack the Kraang while planning to attack the city. Raph and Casey Jones had to work with Slash to stop Newtralizer. After the Kraang Walker was destroyed, Newtralizer was defeated. The final scene of the episode showed that Newtralizer survived the Kraang Walker's destruction, hinting that he'll return.
- Squirrelanoids - The Squirrelanoids are mutant squirrels. They have red skeleton like skin, glowing green eyes and a glowing green mouth. Their mouths contain extra mouths in their jaws. The Squirrelanoid is the result of an eastern gray squirrel drinking from one of the mutagen canisters that fell from the Kraang's stealth-ship during the Kraang's fight with the Turtles as seen at the end of "The Mutation Situation." In "Invasion of the Squirrelanoids," the Turtles find the mutated squirrel and bring it back to the lair. The Squirrelanoid begins to multiply and mutate into hideous forms where they develop secondary mouths (similar to the Xenomorph in Alien) as they are given their name by Mikey. When the Turtles were being overwhelmed by the Squirrelanoids, Splinter arrived and fended them off where they escaped into the tunnels. The Turtles end up going into the tunnels to keep them from reaching the surface and causing havoc. Using some popcorn and his knowledge of comic books, Mikey baited the Squirrelanoids into a grain pipe and flushed them into the septic tanks until Donnie can come up with a retro-mutagen to use on them. However, one of the Squirrelanoids managed to escape and attacked a sewer worker that found the bag of popcorn. In "Fungus Humungous", it appeared as a hallucination as Mikey's worst fear after he was sprayed by one of the mushroom's spawns. In "Metalhead Rewired," at least 3 Squirrelanoids were among the mutants captured by Kraang in order for them to control them. One was first seen with a Parasitic Wasp, Kirby Bat and Spyroach when they discovered Metalhead opened their cells. The second one was seen with Dr. Rockwell and the Newtralizer when Slash punched one of the Kraangdroids. The other was seen with a Parasitic Wasp and Pete before making its way to the portal. One of the Squirrelanoids was seen again in a background when Dr. Rockwell beats up one of the Kraangdroids. With help from Metalhead, the Turtles freed the captive mutants and they escape through the portal.
- Chrome Dome (voiced by Nolan North) - Chrome Dome was an android in a dark ninja outfit (which resembled Chris Bradford's full ninja outfit) that Karai had the Kraang develop in her plan to target April O'Neil. In battle, Chrome Dome can wield two laser swords. During the Foot Clan's fight with the Turtles, Chrome Dome snatches April from her duel with Karai where the Kraang plan to reserve April and it now views both sides as its enemy. Mikey was able to defeat Chrome Dome by running it's laser sword through its chest. In "Vengeance is Mine," another Chrome Dome was used by Shredder as a decoy in order to capture Karai. This Chrome Dome was destroyed by Karai.
- Fungus Humungous (voiced by Fred Tatasciore) - Fungus Humungous is a one-eyed mutant mushroom who can grow smaller mushroom spawns. It can release spores that cause people to see their worst fears. Fungus Humungous was first encountered by a sewer worker who ran by April and Casey ranting about a monstrous squirrel. When April was exposed to the spores, she saw her worst fear of bats including a vision of a mutated Kirby. The Turtles came with Casey to find April. When Casey was exposed to the spores, he experienced his fears of being overwhelmed by a swarm of rats. When the Turtles find April, one of Fungus Humungous's mushroom spawns attacked where Raph was exposed to the spores, causing him to see Leo as a giant cockroach. The Turtles find a lair filled with mushroom spawns causing Leo, Donnie, and Mikey to fight them. Mikey gets exposed to the spores and experiences his fear of the Squirrelanoids. Donnie gets exposed as well causing him to experience his fear of April hating him. Leo then gets exposed as well causing him to experience the fear of losing his team. Leo then falls into the lair of Fungus Humungous where he finds that the mutagen is responsible for its creation. As Fungus Humungous spreads its spawns, Mikey fights through its spawns while facing his fears. Leo faces his fears and discovers that Fungus Humungous can't stand sunlight. Once Leo lets in a lot of sunlight through the hole in the ceiling, he uses it to defeat Fungus Humungous and neutralize the spores on the others. A twist ending revealed that one of Fungus Humungous' spawns had survived when Mikey found it on his pizza.
- Kraathatrogons - The Kraathatrogons are alien worms from Dimension X. The Kraang "milk" them for the mutagen since they are where the Kraang's mutagen comes from. The antennae of the Kraathatrogon will enable them to be controlled by anyone who wants to ride them. Donatello had to reverse-engineer the portal in order to get rid of the Kraathatrogons. During the fight with the Kraang, one of the Kraathatrogons made it to the surface and swallowed Tiger Claw. When Leo reverse engineers the portal, the Kraathatrogons are sucked in. One of the Kraathatrogons ended up in the 80s' Teenage Mutant Ninja Turtles dimension. The Kraathatrogon reappears in a flashback of "The Wrath of Tiger Claw" where it was killed when Tiger Claw cut it open in order to escape easily.
- Antonio / Pizza Face (voiced by John DiMaggio) - In this show, Antonio was an Italian pizza chef who ran Antonio's Pizza until he ingesting mutagen thinking that it would be a good pizza topping, transforming himself into a big mutant pepperoni and mushroom pizza with arms, a mouth, and eyes made of pepperoni that can control different pizzas into coming to life and attaching itself to its victims in a zombie-like state in order to control it. When Mikey goes to Antonio's Pizza to get his money back, he finds the other victims of Pizza Face as he is attacked by them. Upon returning to the lair, Mikey finds that his fellow Turtles and Splinter have become affected as Mikey fights off Pizza Face's pizzas. Mikey ends up interrogating one of Pizza Face's pizzas to find out who he works for. The pizza ends up telling Mikey about his origin and plans to feed off them. After putting the pizza into the freezer with Ice Cream Kitty, Mikey infiltrates Antonio's Pizza restaurant where Pizza Face is starting to make the humans into calzones for him to feed off of. Mikey confronts Pizza Face (who actually liked being called that) and ends up fighting the pizza-controlled Turtles until he ends up trapped in Pizza Face's cheese. Upon eating his way out of the cheese, Mikey fights his way past Pizza Face's victims where he ends up swallowed up by Pizza Face only to eat himself up. Mikey threatens Pizza Face to free his victims or else, and Pizza Face does what Mikey does as every one he brainwashed is freed. Even though it seemed like a nightmare to Mikey, it turns out that Pizza Face's slice had survived and is hiding out in one of the pizza boxes, foreshadowing his return.
- Creep - Creep is a character introduced in Season 3. He appears to be a mutant creature made of mud and moss that wears the clothes of a sunbeaten scarecrow.
- Dream Beavers - The Dream Beavers are oversized mutant beavers with dream-infiltrating abilities that will be introduced in Season 3.
- Metalhead - Metalhead was a durable turtle robot built by Donatello from salvaged Kraang technology. Donnie uses Metalhead to fight the Kraang. Metalhead also has many weapons at its disposal such as a flamethrower and a laser cannon.
- Carlos Chiang O'Brien Gambe (voiced by Jim Meskimen) - Carlos Chiang O'Brien Gambe is a local TV news reporter who reports on the different happenings in Manhattan.
- Dr. Tyler Rockwell (voiced by Frank Welker) - Dr. Tyler Rockwell was a neurochemist who was Victor Falco's science partner and colleague until he was unknowingly used as a subject in Falco's experiment involving mutagen, a neurochemical, and monkey DNA. April and the Turtles learn Rockwell has gone missing and investigate. They discover that Falco had transformed Rockwell into a humanoid mutant chimpanzee that can sense emotion. So far, it hasn't been shown what Tyler Rockwell's human form looks like. In "Metalhead Rewired," Dr. Rockwell's mutated form was among the mutants captured by Kraang in order for them to control them. He was first seen brainwashed in his chamber when the Turtles discovered him. After Metalhead sent Rockwell free, he, Newtralizer and a Squirrelanoid escape, then Rockwell beats up one of the Kraangdroids before heading to the portal. With help from Metalhead, the Turtles freed the captive mutants and they escape through the portal. In "Mazes & Mutants", the Turtles fight the Monkey Goblins used by Sir Malachi all resemble Rockwell. The Turtles find the Monkey Goblins to be someone they know. The illusions were seen again when Sir Malachi left.
- Mr. Murakami (voiced by Sab Shimono) - Mr. Murakami is a blind, skillful Japanese chef who runs a noodle shop. He becomes a friend to the Turtles after they save him from an extortion attempt by the Purple Dragons. Despite being blind, he knows what the Turtles are, but isn't afraid of them. Murakami rewards the Turtles with a dish called "Pizza Gyoza" (a type of Japanese-style dumpling that is stuffed with pizza ingredients) which the Turtles love. April and The Turtles address Mr. Murakami as "Murakami-san."
- Joan Grody (voiced by Kari Wahlgren) - The hostess of a TV show called "Grody to the Max."
- 80's Teenage Mutant Ninja Turtles - While in a room full of portals, Donatello, April O'Neil, and Casey Jones look into a portal where they see their 80's counterparts. In the final scene, the 80's Teenage Mutant Ninja Turtles see a Kraathatrogon emerge in Manhattan and engage it. The 80's Turtles are also seen in a flashback of "The Wrath of Tiger Claw", where they encounter Tiger Claw in their own dimension when he got out of the Kraathatrogon. It is unknown what happened to them after Tiger Claw fought them.
- 80's Leonardo (voiced by Cam Clarke) - 80's Leonardo is the 80's counterpart of Leonardo.
- 80's Donatello (voiced by Barry Gordon) - 80's Donatello is the 80's counterpart of Donatello. An error in the credits shows 80's Donatello is credited as Townsend Coleman.
- 80's Raphael (voiced by Rob Paulsen) - 80's Raphael is the 80's counterpart of Raphael.
- 80's Michelangelo (voiced by Townsend Coleman) - 80's Michelangelo is the 80's counterpart of Michelangelo. An error in the credits shows 80's Michelangelo is credited as Barry Gordon.
- Martin Milton/Sir Malachi (voiced by Paul Reubens) - Martin Milton is a man who played "Mazes & Mutants" so much that he played it for every hour of every day. One day, he was exposed to a falling mutagen canister. As a result of him having fed some sparrows on the roof at the same time, Martin became a "Sparrow Wizard." Sir Malachi is a mutant sparrow with a left peg leg. He wears medieval-style hood and tunic and carries a staff with an egg-shaped decoration on top where he performs magic and illusions. He used his magic to send the Turtles into the "Mazes & Mutants" game where he has them go through the quest in order to defeat the dragon and free Princess April. The Turtles go through Sir Malachi's game where the first riddle involves fighting the Monkey Goblins that resemble Dr. Tyler Rockwell's mutant form. When Raphael challenges Sir Malachi, he turns Raphael's head into a turkey's head. The next riddle Sir Malachi gives involves the Turtles evading a rolling fireball. When the Turtles find April and end up fighting a dragon that resembles Leatherhead, Sir Malachi arrives upon the dragon's defeat where he wants the Turtles to play his game until his heart is content. Leonardo states that Sir Malachi is a mutant who created the maze in their mind. Raphael throws Michelangelo's Ring of Awesomeness towards Sir Malachi. Upon the Turtles not believing in Sir Malachi's illusion, the spell is broken and the Turtles learn Sir Malachi's origin. After being promised not to play the "Mazes & Mutants" his way again, Sir Malachi leaves. The creators of this show have said that Malachi's character was inspired by the role-playing games that they all enjoy and they very much wanted a "wizard" character.
- Napoleon Bona-frog (voiced by Jon Heder) - A mutant frog.
- Muckman and Joe Eyeball - A mutant garbage-looking humanoid mutant and a mutant with a large eyeball.
The following characters appear in the TV shows that are watched by the Teenage Mutant Ninja Turtles:
Space Heroes characters
Space Heroes is fictional animated science fiction TV series that is Leonardo's favorite show. It is a parody of Star Trek: The Animated Series.
- Captain Ryan (voiced by Brian Bloom) - The main hero and leader of a spaceship crew in "Space Heroes." He resembles Captain James T. Kirk.
- Crankshaw (voiced by Scott Menville) - A young ensign who Captain Ryan slaps every time he panics.
- Dr. Mindstrong (voiced by Ben Cross) - An alien scientist.
- Commander Grundch (voiced by Nolan North) - The second-in-command of Captain Ryan.
Super Robo Mecha Force Five characters
Super Robo Mecha Force Five is a fictional anime show that was discovered by Michelangelo in "Mutagen Man Unleashed" and has very bad acting. It is also called SRMFF! for short. The series is a pastiche of the animated series Voltron and includes elements of the anime Mazinger Z and the Power Rangers franchise. Unlike Space Heroes, all four Turtles like the show.
- Captain Dash Coolstar (voiced by Brian Bloom) - The leader of the Super Robo Mecha Force Five and main character of the "Super Robot Mecha Force Five" anime who controls the torso of Mighty Super Robo Mecha.
- Dr. Blip (voiced by Scott Menville) - The scientist of the team who controls the right leg. He represents Donatello. Similar to Crankshaw, Dr. Blip gets slapped by Captain Dash Coolstar every time he panics.
- Squeakums - An alien monkey and animal sidekick of the team who pilots the right arm.
- Lunk (voiced by Nolan North) - The member who controls the left arm.
- Princess (voiced by Mae Whitman) - The female member who pilots the left leg. She is the princess of an entire planet and Dr. Blip has a crush on her.
- "Tuning in to TV: Teenage Mutant Ninja Turtles have new series, toys". The Washington Times. July 29, 2012. Retrieved September 23, 2012.
- "Teenage Mutant Ninja Turtles". Shows. YTV. Retrieved September 23, 2012.
- Lowry, Brian (2012-09-26). "Variety Reviews - Teenage Mutant Ninja Turtles - TV Reviews - - Review by Brian Lowry". Variety.com. Retrieved 2012-10-20.
- "Jason Biggs replaced by Seth Green as voice of Leonardo on Teenage Mutant Ninja Turtles cartoon series". Metro.co.uk. 2014-06-19. Retrieved 2014-06-20. "Rumours have been circulating in recent weeks as to Biggs’ future in the hit animated franchise, with Dominic Catrambone voicing the character in recent episodes."
- "Nickelodeon Renews 'Teenage Mutant Ninja Turtles' for Season 4 (Exclusive)". Hollywood Reporter. Retrieved 2014-06-17.
- "Leonardo - Ninja Turtles - TMNT Characters". Nick.com. 2012-05-23. Retrieved 2012-10-20.
- "Donatello - Ninja Turtles - TMNT Characters". Nick.com. 2012-05-23. Retrieved 2012-10-20.
- "Raphael - Ninja Turtles - TMNT Characters". Nick.com. 2012-05-23. Retrieved 2012-10-20.
- "Michelangelo - Ninja Turtles - TMNT Characters". Nick.com. 2012-05-23. Retrieved 2012-10-20.
- April's official profile
- "Corey Feldman is Slash for Nick's TMNT". Theouthousers.com. Retrieved 2013-07-16.
- Exclusive: Teenage Mutant Ninja Turtles Guest Cast Includes Roseanne Barr - Today's News: Our Take | TVGuide.com
- "'TMNT' embraces animated Turtle power in five ways". Usatoday.com. 2013-04-03. Retrieved 2013-07-16.
- Comic-Con: Nickelodeon Sets 'Legend of Korra,' 'Ninja Turtles' Panels (Exclusive) Hollywood Reporter, Retrieved July 13, 2013
- "Filmography | The Official Clancy Brown Web Site". Clancybrown.com. Retrieved 2012-10-20.
- "Episode 38 Guest: Nolan North". Rob Paulsen Live. 2012-04-27. Retrieved 2012-07-07.
- "Episode 36 Guest: Phil Lamarr". Rob Paulsen Live. 2012-04-13. Retrieved 2012-07-07.
- "New TMNT Animated Series: These aren't the same old turtles!". Io9.com. Retrieved 2013-07-16.