Käptn Superslip und der perverse Plan von Professor Powerpuuups. Der vierte Heldenroman von Rotzo Pizzaschnüffler

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For use in schools and libraries only. Harold and George's time-traveling Purple Potty lands them in an alternate universe where everything seems delightful, but evil lurks just beneath the surface, and leads to a battle between Captain Underpants and his own evil twin.