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It's Michaelangelo's birthday, but none of his brothers seem to remember, and it frustrates him greatly. Meanwhile, Shredder and Krang discover what is possibly an 'anti-mutagen' that, after testing it on three rock soldiers, can undo mutations. Shre... (more)dder, Bebop and Rocksteady are sent to use it on the Turtles, and our heroes have a few close calls.