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In Captain Underpants and the Preposterous Plight of the Purple Potty People, George and Harold use the Purple Potty to travel to an alternate universe where everything is delightful, but they soon encounter their evil twins who plan to conquer their original world. To stop their evil counterparts and Captain Blunderpants, the boys must face their cleverest enemies yet—themselves—with help from new heroes like Great-Granny Girdle and Boxer Boy
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