Crys-Mu, the spirit of light, grants the Teenage Mutant Ninja Turtles Mutastones that allow them to morph into Super Turtles, albeit temporarily for three minutes. On the other hand, the nefarious Shredder and his cohorts, Bebop and Rocksteady, come upon the Dark Mutastone that alters their appearance to Devil Shredder, Supermutant Bebop, and Supermutant Rocksteady. Despite the setback, the Turtles have one more trick up their sleeves: merging to become the formidable Turtle Saint.
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