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Teenage Mutant Ninja Turtles

In the Batman/Teenage Mutant Ninja Turtles crossover, Riddler is turned into a mutant raccoon by the Shredder, along with other mutated inmates of Arkham Asylum. After Shredder is defeated by Batman and the Turtles, the police scientists have managed to turn him and the rest of inmates at Arkham back to normal and are currently in A.R.G.U.S. custody.