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Captain Kruppy The Underpants Kid is what George called Melvin after Mr. Melvin snapped his fingers and Melvin transformed into Captain Underpants in Captain Underpants and the Big, Bad Battle of the Bionic Booger Boy - Part 2: The Revenge of the Ridiculous Robo-Boogers. He turned into him after Melvin and Mr. Krupp changed brains.

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