
Captain Underpants and the Preposterous Plight of the Purple Potty People is the eighth Captain Underpants book written by Dav Pilkey. At the end of the previous book, George, Harold, Sulu and Crackers time-traveled again. In this book, they come to a place that they realize is an alternate reality where everything is the opposite. They see evil George, evil Harold and evil Captain Underpants, who hypnotize Sulu to make him evil.