To prove that Turtles can be friends with humans, Michelangelo uses a social networking site to befriend a famous martial artist who is secretly Shredder's top lieutenant.

Leo fears his act of mercy has come back to haunt him when Xever holds a local noodle shop owner hostage.

After April receives a warning from her imprisoned father, she and the Turtles embark on a mission to save him and stop The Kraang from detonating a mutagen bomb in the city.

The Turtles must defend their home in the sewers when Chris Bradford tries to destroy it with a dangerous chemical.

When simultaneous threats from the Purple Dragons and Baxter Stockman’s mechanical Mousers force the Turtles to split into two groups, Donnie & Mikey must prove that their “B Team” is just as valuable as Leo & Raph’s “A Team.

Snakeweed returns and begins abducting people. Tired of Raphael's constant criticism while trying to stop Snakeweed, Leonardo lets Raphael try his hand at leadership. While away from the group, Leonardo meets a female Foot Ninja named Karai, who tries to lure him to the dark side.

The Turtles discover that the Kraang survived their previous showdown and have dropped mutagen canisters all over New York City.

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 the city.

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.

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.

Michelangelo plays with some mutagen, contracting a dangerous infection that mutates out of control.

April tries to resume her normal life; April realizes that she may have put her friend in jeopardy when Karai starts hunting her again.

The Turtles find themselves being hunted by a new threat -- another mutant turtle called Slash, who has a personal vendetta against the brothers.

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 and work together against a common foe.

April feels left out and insists on joining the Turtles on a mission to TCRI; A secret about April's past is revealed...

A fungus mutant spreads through the sewers causing the Turtles to experience their worst fears. Leonardo must face his greatest fear.

After Donnie upgrades Metalhead's artificial intelligence, he must decide if he can trust a sentient Metalhead.

When the Rat King returns, Splinter must overcome his fears in order to defeat his enemy.

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.

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.

When the turtles play a Fantasy LARP game to get their minds off things, they separate the difference between fantasy and reality.

The Turtles create a retro-mutagen to help April's father; Baxter Stockman threatens to mutate April.

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.

Mikey struggles to convince the others that a new mutant is trying to attack and capture people using living pizzas.

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, forcing her to make a life changing decision.

Leo tries to convince the team to rescue Karai; a master thief steals Shredder’s helmet.

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, before the Kraang controlling his body destroys his brothers or worse, reveals their location to the rest of the Kraang.

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.

Donnie becomes increasingly jealous of April and Casey's relationship; April is kidnapped by an evil spirit who intends to drain her powers.

When the Turtles go to the bizarre realm of Dimension X, Mikey is the only one who can figure the place out.

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 from the team.

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 from the team.

Leo takes the Turtles to train in the woods in an advanced ninja ritual; the Turtles must overcome their weaknesses and face their enemies to become a true ninja.

As the Turtles search for Karai, they are forced to deal with a city filled with Kraangdroids as well as Zeck and Steranko.

Casey Jones thinks he can take on the criminal underworld on his own, but soon discovers that he is in over his head.

The Shredder kidnaps and experiments on the Mighty Mutanimals.

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The Turtles and their enemy crash-land on an ice moon and they must put aside their differences in order to survive.

Casey releases a wish-granting alien named Wyrm, who wants his freedom to do whatever he wants to the universe

A shark-like bounty hunter is hired by Lord Dregg to destroy the turtles, who choose to hide out in an abandoned space station.

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The Turtles must gain the trust of the Utrom Council in order to find the next piece of the black hole generator.

The Turtles journey through an ocean-like area of space.

The Turtles are transported to another dimension where they meet their 1980s counterparts and work together to battle Krang.

Donatello is feeling inferior to Fugitoid, but his intellect is put to the test when the Triceratons attack.

When Raphael loses his fighting mojo, he must overcome his feelings to save his brothers from certain doom.

The team must overcome impossible odds in order to obtain the final Black Hole Generator piece that is located on the planet Magdomar.

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When Leonardo secretly allies himself with Karai, he gets himself into deeper danger than he could have realized.

Raphael must overcome his fear of insects to lead the team when they are forced to battle Stockman-Fly's new insect minions.

Don Vizioso's gang tracks the Turtles with a slew of Anti-Mutant weapons.

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For the first time, the Turtles encounter something they cannot defeat – the Super Shredder!

The Turtle team hunts for their Sensei, but soon realizes they are being hunted as well.

Donatello becomes concerned and decides to test April, only to discover that her psychic abilities are rapidly growing in power.

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With the demise of their beloved father and Karai incapacitated, the Turtles, April, and Casey, infiltrate Super Shredder's new lair to put an end to Oroku Saki once and for all, no matter what it takes.