Teenage Mutant Ninja Turtles (2012 TV series) (season 2)

Teenage Mutant Ninja Turtles (season 2)
Country of origin United States
No. of episodes 26
Original network Nickelodeon
Original release October 12, 2013 (2013-10-12) – September 26, 2014 (2014-09-26)
Season chronology

The second season of Teenage Mutant Ninja Turtles aired on Nickelodeon from October 12, 2013 to September 26, 2014.


On October 2, 2012, Nickelodeon ordered a second season of Teenage Mutant Ninja Turtles.[1][2]

Executive producer Ciro Nieli confirmed that Mutagen Man will have a large role in the second season and an hour-long episode featuring the voice actors of the original TMNT series (Cam Clarke, Townsend Coleman, Barry Gordon, and Rob Paulsen) in their respective roles for a cameo.[3][4]

Corey Feldman (who was the voice of Donatello from the first and third entries of the original film series) was confirmed to play the role of Slash.[5] Recurring TMNT character Casey Jones was confirmed to appear in the second season of the series, where he is voiced by Josh Peck.[6][7]

Jason Biggs departed the role of Leonardo after the 19th episode of season 2 and was temporarily replaced by Dominic Catrambone.[8] Seth Green assumed the role beginning in season 3.[9]


No. in
TitleDirected byWritten byOriginal air date[10]Prod.
U.S. viewers
271"The Mutation Situation"Sebastian Montes & Ciro NieliBrandon AumanOctober 12, 2013 (2013-10-12)2012.68[11]
The Turtles' mission to prevent the Kraang from delivering a shipment of mutagen to the Shredder causes the mutagen canisters to scatter into the city, where one of them hits Kirby O'Neil, causing him to turn into a vampire bat mutant. Extremely upset and disappointed in the brothers' for her father's mutation, an angry April O'Neil walks out on them.
282"Invasion of the Squirrelanoids"Michael ChangTodd GarfieldOctober 19, 2013 (2013-10-19)2032.61[12]
While searching for the missing mutagen, the Turtles encounter a squirrel forcing its way down the throat of a homeless man. After taking him back to their lair for study, the Turtles are shocked when the creature multiplies within the man's stomach and escapes.
293"Follow the Leader"Alan WanEugene SonNovember 2, 2013 (2013-11-02)2022.49[13]
Shredder heads to Japan to get more forces for his army, leaving Karai in charge of the Foot Foot. Meanwhile, Leonardo is having a hard time getting his brothers to listen to him, but when he gets captured by Karai's new weapon, the Foot-bots, which can adapt to his moves, the others must rescue him and find a way to counter the Footbots.
304"Mutagen Man Unleashed"Sebastian MontesKevin Burke & Chris "Doc" WyattNovember 9, 2013 (2013-11-09)2042.67[14]
Donnie becomes very jealous of a student April is tutoring in math named Casey Jones and vents his sorrows to Timothy. The mutated Pulverizer, affected by this, then begins feeding on the experimental mutagen, enabling him to form sludgy arms and legs, transforming him into the Mutagen blob mutant "Mutagen Man" before escaping to find and persuade with April.
315"Mikey Gets Shellacne"Alan WanThomas KrajewskiNovember 16, 2013 (2013-11-16)2052.67[15]
Michelangelo plays with some rejected retro-mutagen samples and contracts a dangerous acne infection that mutates out of control. The Turtles head to the remains of TCRI to find a molecular centrifuge to make an antidote for the infection and find Baxter Stockman with the only one in his possession. Without the centrifuge to help with the cure, Mikey is doomed, so he does whatever it takes to retrieve it, later running afoul of Dogpound, who is mutated by a second mutagen batch into the werewolf-like supermutant "Rahzar".
326"Target: April O'Neil"Michael ChangNicole DubucNovember 23, 2013 (2013-11-23)2062.54[16]
The Kraang and Karai continue their pursuit of April with an advanced Foot Bot called "Chrome Dome". With no other choice, April must put aside her grudge against the Turtles (After realizing that she may have put her friends, most notably Casey Jones, in jeopardy) and repair her friendship with them, sealing it with a kiss on Donnie's cheek as an apology, to take down both Chrome Dome and a squadron of Foot Bots.
337"Slash and Destroy"Sebastian MontesGavin HignightNovember 30, 2013 (2013-11-30)2072.51[17]
After Raph's pet box turtle Spike drinks some mutagen, he mutates into a spiky, hulking box turtle mutant, renaming himself "Slash". Slash offers Raph a chance to join with him and form an ultimate ninja team, to which Raph happily accepts, thrilled by the idea of fighting crime side-by-side with his newly mutated buddy. However, Slash's true motives eventually emerge: the elimination of Leo, Donnie, and Mikey.
348"The Good, the Bad, and Casey Jones"Michael ChangJohnny HartmannFebruary 2, 2014 (2014-02-02)2092.69[18]
Casey Jones establishes a new motive to protect New York from any future attacks from ninja and mutants. Casey ends up meeting Raphael (who is learning about anger control from Splinter) and since he is both a mutant and a ninja, Casey considers him a threat. Casey ends up following Raph to the sewer lair and discovers the existence of Splinter and the other three Turtles, as well as their friendship with April. However, he unintentionally leads the Foot Bots to the lair. Raph and Casey have to set aside their differences before their location is revealed.
359"The Kraang Conspiracy"Alan WanBrandon AumanFebruary 9, 2014 (2014-02-09)2082.87[19]
April feels left out and insists on joining the Turtles on a mission to a newly-rebuilt TCRI. During this time, a secret about April's origins is revealed by a mysterious man.
3610"Fungus Humungous"Sebastian MontesMark HenryFebruary 16, 2014 (2014-02-16)2102.81[20]
When the spawns of mutated sentient mushrooms spread through the sewers, their spores cause April, Casey, and the Turtles to experience their worst fears. Leonardo must face his greatest fear of losing his team in order to stop the Fungus.
Note: April's scared of bats, Casey's scared of rats, Raph's scared of cockroaches, Mikey's scared of the Squirrelanoids, Donnie's scared of April hating him, Leo's scared of being a bad leader and the Fungi are scared of the sunlight.
3711"Metalhead Rewired"Alan WanPeter Di CiccoFebruary 23, 2014 (2014-02-23)2112.66[21]
After Donnie upgrades Metalhead's artificial intelligence, the other Turtles become suspicious of the new, sentient Metalhead. At the same time, the Turtles stumble upon the Kraang's plot where they have been capturing the mutants so that they can control them.
3812"Of Rats and Men"Sebastian MontesTodd GarfieldMarch 2, 2014 (2014-03-02)2122.7[22]
When the Rat King returns, Splinter must overcome his fears of being controlled by Rat King in order to defeat his enemy. Meanwhile, Michelangelo adopts a stray cat that April found after it unknowingly eats ice cream and mutagen transforming it into "Ice Cream Kitty."
39–4013–14"The Manhattan Project"[23]
Michael Chang & Alan WanBrandon Auman & John ShirleyMarch 14, 2014 (2014-03-14)997[25][26]2.36[27]

When Shredder returns from Japan with a new apprentice, a Bengal tiger mutant called Tiger Claw, Leo considers asking Splinter for help. Meanwhile, Donnie must put aside his rivalry with Casey in order to uncover a Kraang plot that involves gigantic blue worms, which are the source of mutagen called Kraathatrogons that caused earthquakes all over New York.

Note: This episode was released 12 days early (March 2, 2014) on official distributors for the series, including Nick.com. Cam Clarke, Townsend Coleman, Barry Gordon and Rob Paulsen (who plays Donatello in this series) reprise their roles as the 1987 counterparts of Leonardo, Michelangelo, Donatello, and Raphael, respectively, at the end of the episode. Gordon and Coleman were incorrectly credited for each other's role in the credits. Promotional material listed this episode as "Wormquake!", while the title used within the episode itself is "The Manhattan Project".
4115"Mazes & Mutants"Michael ChangEugene SonApril 27, 2014 (2014-04-27)2152.67[28]
The Turtles try to relax by playing a role-playing game called "Mazes & Mutants," but the game becomes real when a house sparrow mutant named "Sir Malachi" sends the Turtles into the game in order to make it through the maze, defeat the dragon, and save Princess April.
4216"The Lonely Mutation of Baxter Stockman"Sebastian MontesBrandon AumanMay 4, 2014 (2014-05-04)2162.32[29]
Donnie finally discovers a Retro-Mutagen that can restore Kirby to his human form as he, the other Turtles and April set out to find him. Meanwhile, Stockman gets mutated by Shredder into the housefly mutant "Stockman-Fly" for his 74 consecutive failures to create a perfect mutant army. When he finds out about the Retro-Mutagen, he kidnaps April and demands that the Turtles hand it over to him in exchange for her, prompting the Turtles and Casey to go and rescue her, whilst facing off against Razhar.
4317"Newtralized!"Alan WanGavin HignightMay 11, 2014 (2014-05-11)2172.03[30]
Tension arises between Raph and Casey due to Casey's inability to handle bigger mutant threats. This issue is truly put to the test when Raph and Casey cross paths with Slash and his new partner: the Newtralizer.
4418"Pizza Face"Sebastian MontesKevin Burke & Chris "Doc" WyattMay 18, 2014 (2014-05-18)2182.29[31]

When living pizzas begin turning people into zombies, including Leo, Raph, Donnie, Splinter, and April, it's up to Mikey to save them from their leader, a pepperoni and mushroom pizza mutant named "Pizza Face".

Note: In this episode, Leonardo is voiced by Dominic Catrambone instead of Jason Biggs.
4519"The Wrath of Tiger Claw"Michael ChangChristopher YostJune 8, 2014 (2014-06-08)2192.30[32]

Tiger Claw returns and vows revenge on the Turtles and works with Karai on a ruse to locate their lair, but it fails when the truth about herself as Splinter's long-lost daughter Miwa, is revealed to her and she furiously turns against him and the Foot clan. Unfortunately for Karai, Shredder imprisons her in a cell now that she knows the truth.

Note: Jason Biggs voices Leonardo for the last time.
4620"The Legend of the Kuro Kabuto"Alan WanDoug LangdaleJune 15, 2014 (2014-06-15)2201.87[33]

Feeling ashamed of himself for losing Karai to Shredder like Splinter did, Leo talks the other Turtles to help him rescue her. Meanwhile, Anton Zeck, a professional thief in a high-tech energy suit, is hired by Ivan Steranko, a Russian arms dealer and artifact collector who is an old mafia business partner of Shredder's, to steal Shredder's helmet, the "Kuro Kabuto". When the Turtles accidentally come into possession of the Kabuto, however, they decide to use it to their advantage and trade it for Karai, eventually leading to an all-out battle between them, Zeck, and Shredder's forces to claim it.

Note: Leonardo is voiced by Dominic Catrambone for the last six episodes of the second season.
4721"Plan 10"Michael ChangHenry GilroyJune 22, 2014 (2014-06-22)2212.13[34]
When Raphael accidentally switches minds with a Kraang after one of their Earth infiltration devices is damaged, he must find a way out of the Technodrome and back to his body without being discovered before "Plan 10" goes into full effect.
4822"Vengeance is Mine"Sebastian MontesPeter Di CiccoJune 29, 2014 (2014-06-29)2222.17[35]
Leo stages a rescue for Karai against Splinter's wishes. While the mission is a success, Karai's knowledge of the truth makes her rush out to take her revenge on Shredder for killing her mother and lying to her for so long, leading to an unexpected turn of events. Because of Shredder's careless actions, Karai inadvertently falls into a vat of mutagen, turning her into a mindless snake-like creature when Shredder originally planned to have the Turtles' fall in the mutagen instead.
4923"A Chinatown Ghost Story"Alan WanRandolph HeardSeptember 12, 2014 (2014-09-12)2231.33[36]
The evil spirit of a powerful Shang Dynasty martial artist named Ho Chan is released by the Purple Dragons. He uses them to kidnap April and another classmate of hers, Irma Langenstein, so that he can drain their vital life-force energy. Donnie and Casey have to work together to rescue the two and face Leo, Raph, and Mikey when Ho Chan turns them into his brainwashed-soldiers.
5024"Into Dimension X!"Sebastian MontesDoug LangdaleSeptember 19, 2014 (2014-09-19)2241.70[37]
After receiving a message from an aged Leatherhead that the Kraang have perfected the mutagen, Mikey heads to Dimension X to rescue him by using the portal the Turtles have. The others follow him, and they will need Mikey's expertise to figure out the Dimension in order to find the Kraang's fortress, which is guarded by the rock monsters Traag and Granitor, rescue Leatherhead and stop the Kraang's terraforming plot.
5125"The Invasion" (Part 1)Michael ChangBrandon AumanSeptember 26, 2014 (2014-09-26)2251.63[38]
As a last resort at getting back at the Turtles and Splinter for Karai's mutation, Shredder and the Kraang join forces as the Kraang launch a full-scale Invasion on Earth. With the Kraang now attacking New York, Leo and Donnie argue over strategies for defeating the Kraang.
5226"The Invasion" (Part 2)Alan WanJohn ShirleySeptember 26, 2014 (2014-09-26)2261.63
With their home destroyed by Irma, who was revealed to be the Kraang's second-in-command, Kraang Sub-prime, in disguise, and the mutagen greatly perfected, the Turtles, April, and Casey must survive the ongoing assault of the Kraang Invasion, while Leo goes head-to-head with Shredder's men and his army of foot-soldiers. Meanwhile, Splinter and Leatherhead go one-on-one with the Shredder himself.


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