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.
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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.
Facing Shredder's deadly new assassin, Leo must decide whether to risk his brother's lives or ask for Splinter's help.
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