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Episode 1
The Mutation Situation
The Turtles discover that the Kraang survived their previous showdown and have dropped mutagen canisters all over New York City.
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Episode 2
Invasion of the Squirrelanoids
While tracking mutagen, the Turtles bring a mutated squirrel back to the lair. When it starts multiplying, the Turtles must hunt the squirrel mutants and prevent them from escaping into…
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Episode 3
Follow the Leader
The Turtles face an army of robot foot soldiers; Karai captures Leonardo and forces him to do battle with ninjas that can adapt to his every move.
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Episode 4
Mutagen Man Unleashed
Donatello experiments with mutagen in an attempt to find a cure for April's mutated father. But one of his expirements goes wrong and he is unleashed in the city.
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Episode 5
Mikey Gets Shellacne
Michelangelo plays with some mutagen, contracting a dangerous infection that mutates out of control.
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Episode 6
Target: April O’Neil
April tries to resume her normal life; April realizes that she may have put her friend in jeopardy when Karai starts hunting her again.
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Episode 7
Slash and Destroy
The Turtles find themselves being hunted by a new threat -- another mutant turtle called Slash, who has a personal vendetta against the brothers.
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Episode 8
The Good, The Bad, and Casey Jones
After encountering mutants and ninjas, Casey Jones decides to take on "pure evil" alone. When he meets Raphael, the two hot-headed fighters must put their dislike for each other aside…
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Episode 9
The Kraang Conspiracy
April feels left out and insists on joining the Turtles on a mission to TCRI; A secret about April's past is revealed...
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Episode 10
Fungus Humungous
A fungus mutant spreads through the sewers causing the Turtles to experience their worst fears. Leonardo must face his greatest fear.
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Episode 11
Metalhead Rewired
After Donnie upgrades Metalhead's artificial intelligence, he must decide if he can trust a sentient Metalhead.
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Episode 12
Of Rats and Men
When the Rat King returns, Splinter must overcome his fears in order to defeat his enemy.
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Episode 13
The Manhattan Project (1)
Leonardo considers asking Splinter for help while facing Shredder's new assassin; Donnie must put aside his rivalry with Casey in order to uncover a Kraang plot.
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Episode 14
The Manhattan Project (2)
Leonardo considers asking Splinter for help while facing Shredder's new assassin; Donnie must put aside his rivalry with Casey in order to uncover a Kraang plot.
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Episode 15
Mazes & Mutants
When the turtles play a Fantasy LARP game to get their minds off things, they separate the difference between fantasy and reality.
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Episode 16
The Lonely Mutation of Baxter Stockman
The Turtles create a retro-mutagen to help April's father; Baxter Stockman threatens to mutate April.
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Episode 17
Newtralized!
Raphael is worried about Casey's ability to handle big mutant threats especially when they meet Slash again and discover he has a partner of his own, the Newtralizer.
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Episode 18
Pizza Face
Mikey struggles to convince the others that a new mutant is trying to attack and capture people using living pizzas.
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Episode 19
The Wrath of Tiger Claw
When Tiger Claw returns, he vows to hunt and destroy the turtles, as well as April and Casey. Meanwhile, Karai finds out the truth about her mother and real father,…
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Episode 20
The Legend of the Kuro Kabuto
Leo tries to convince the team to rescue Karai; a master thief steals Shredder’s helmet.
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Episode 21
Plan 10
Raphael accidentally damages a machine that forces him to swap minds with a Kraang. Now he must find a way to convince his brothers and Splinter that it's really him,…
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Episode 22
Vengeance is Mine
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…
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Episode 23
A Chinatown Ghost Story
Donnie becomes increasingly jealous of April and Casey's relationship; April is kidnapped by an evil spirit who intends to drain her powers.
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Episode 24
Into Dimension X!
When the Turtles go to the bizarre realm of Dimension X, Mikey is the only one who can figure the place out.
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Episode 25
The Invasion (1)
Leo and Donnie disagree about their plan to stop the Kraang invasion; Donnie must step up as the leader of the bunch when Leo makes a mistake and is separated…
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Episode 26
The Invasion (2)
Leo and Donnie disagree about their plan to stop the Kraang invasion; Donnie must step up as the leader of the bunch when Leo makes a mistake and is separated…