Leonardo meets a beautiful and dangerous female ninja who tries to lure Leonardo to the dark side.
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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 escaping into the city.
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.
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.
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.
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.
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