Captain Underpants 10 : Captain Underpants and the preposterous plight of the purple potty people

George and Harold are trying to take their pet pterodactyl Crackers back to the Cretaceous period, but instead they enter an alternate reality where teachers are nice, kids are allowed to read banned books, and the cafeteria food doesn't smell like dirty diapers. Even worse, they discover alternate versions of themselves - Evil George and Evil Harold - who plan to unleash some preposterous plans on Piqua, Ohio. Now it's up to George and Harold to defeat the evil twins and their superhero, Captain Blunderpants!