Teenage Mutant Ninja Turtles

Facing Shredder's deadly new assassin, Leo must decide whether to risk his brother's lives or ask for Splinter's help. Donnie must put aside his rivalry with Casey in order to uncover a new Kraang plot.

The Turtles try to relax by playing a fantasy role-playing game, but when the game becomes real, they must learn the difference between fantasy and reality.

Feeling guilty for turning April's father into a mutant bat, the Turtles perfect a retro-mutagen to help him. Unfortunately, things get worse when Baxter Stockman threatens to mutate April.

Raph is worried about Casey's ability to handle big mutant threats...when they meet Slash again and discover he has a partner of his own: THE NEWTRALIZER!

Mikey discovers that a new mutant is trying to attack and capture people using living pizzas, but he struggles to convince the others who don't believe him.

Tiger Claw returns and intends to destroy the Turtles at any cost.

Leo, worried about Karai, tries to convince the others to rescue her, while a master thief steals Shredder's helmet, and it falls into the Turtles' unsuspecting hands.

Raph's hot-headed impulsiveness lands him in deep trouble when he accidentally damages a machine that forces him to switch minds with a Kraang.

Leo goes behind Splinter's back when he stages a rescue for Karai, whose desire for revenge against Shredder brings about grave consequences for them all.

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

At home, Mikey always messes things up, but when the Turtles go to the bizarre realm of Dimension X, he's the only one who can figure the place out.

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.