Captain Underpants and the Terrifying Return of Tippy Tinkletrousers is a 2012 American children's novel and the ninth book in the Captain Underpants series by Dav Pilkey. It was published on August 28, 2012, six years after the publication of the previous book. Tippy Tinkletrousers is actually Professor Poopypants, from Captain Underpants and...
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