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. ...

When Casey, Raph, Mikey, and Donnie are captured by a new mutant, April and Leo must overcome disabilities in order to save them. ...

When Casey and Donatello work together to build a hot rod, a mutant challenges them. ...

The turtles get trapped in their dreams by Dream beavers. They can't escape except with the help of a man. ...

Mikey runs away and befriends a mutant frog. Only to learn the frog and his family have nefarious plans. ...

The turtles find an old alien spacecraft that is connected to April's past. ...

When the Turtles discover Bigfoot in the woods, Donnie befriends it and insists they protect it from a hunter. ...

After 3 months of being in a coma,Leo finally wakes up. Raph tries to train him back to normal, but Donnies medicine makes Leo too sick. Leo drops the medicine and create ...

Leo and Donnie disagree about their plan to stop the Kraang invasion. When Leo makes a critical mistake, he is separated from the team and Donnie must step up as a leader ...

After Mikey gets trapped in Dimension X to try and save Leatherhead, his brothers come to his rescue, but they discover that their little brother has changed. ...

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

Leo stages a rescue for Karai against Splinter's wishes. ...

When Raph accidentally damages a Kraang machine, it allows him to switch brains with a Kraang. Now he must find a way to convince his brothers and Splinter that it's real ...

As Leo tries to convince the team to attempt to rescue Karai, Anton Zeck steals Shredder's helmet. ...

When Tiger Claw returns, he vows to hunt and destroy the turtles. Meanwhile, Karai finds out the truth about her mother and real father, forcing her to make a life changi ...

Michaelangelo must battle Pizza Face, a mutant pizza that eats humans, in order to save his family. ...

Raphael is worried about Casey's ability to handle big mutant threats; Raphael and Casey cross the paths of Slash and his new partner. ...

The Turtles create a retro-mutagen to help April's father;Stockman-Fly kidnaps April. ...

When the Turtles play a fantasy LARP game to get their mind off of things, they must separate the difference between fantasy and reality. ...

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. ...

The Rat King returns and tries to take control of Splinter again. Meanwhile, April leaves a cat with Mikey and he turns it into a mutant. ...

When Donnie upgrades Metalhead's artificial intelligence, he must decide if he can trust a sentient Metalhead... or if he has created a new foe. ...

A fungus mutant spreading through the sewers causes the Turtles and April to experience their worst fears as Leonardo must face his greatest fear--losing his team. ...

Feeling left out of the action, April insists on joining the Turtles on a mission to TCRI, where they learn a shocking secret about April's past. ...

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 ...

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

April tries to resume a normal teenage life, but when Karai starts hunting her again, April realizes she may have put her new friend Casey Jones in danger as well. ...

Michelangelo is tired of being the runt of the litter. But when he fools around with some mutagen, he gets a dangerous infection that is mutating out of control. ...

Donatello obsessively experiments with mutagen in a bid to find a cure for April's mutated father. Unfortunately this puts April in danger from a new threat--Mutagen Man! ...

When the Turtles face Shredder's newest threat, an army of Robot Foot Soldiers, Karai captures Leonardo and forces him to do battle with these new and improved ninjas tha ...

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 esc ...

When Shredder teams with the Kraang to receive a batch of mutagen, the Turtles' problems only get worse--even putting their friendship with April at stake. ...