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The Mutation Situation: When Shredder teams with the Kraang to receive a batch of mutagen, the Turtles' problems only get worse - putting their friendship with April at stake. (S2, ep1)

The Mutation Situation: When Shredder teams with the Kraang to receive a batch of mutagen, the Turtles' problems only get worse - putting their friendship with April at stake. (S2, ep1)