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Captain Underpants and the Terrifying Return of Tippy Tinkletrousers 9781407226804 allowing bird calls to beGeorge and Harold are behind bars for a crime they didn't commit! But just as they are settling into their new life, they are pulled from prison by a time travelling tyrant named Tippy Tinkletrousers! Now the boys are taking a trip back in time to the carefree days of kindergarten, when the scariest thing they had to face was not evil mad scientists or alien cafeteria ladies but a sixth grade bully named Kipper Krupp, the nephew of their clueless