The Turtles learn of a new Kraang plot, and face a deadly new assassin. As Leo struggles to decide whether to risk his brothers’ lives or ask for Splinter’s help, Donnie struggles to put aside his rivalry with Casey. Then, when the Turtles try and relax by playing a fantasy role-playing game, they must learn the difference between fantasy and reality. And the Turtles will battle new enemies and old, including Slash and the Newtrailizer, who have now teamed up, Baxter Stockman with plans to mutate April, Pizza Face, and Karai! The Turtle action continues when a master thief steals Shredder’s helmet, Raph switches minds with a Kraang, and April is kidnapped! Then, enter the mysterious and bizarre realm of Dimension X, and get ready for the ultimate Kraang invasion where the Turtles break out the Turtle Mech and face Kraang Prime!