Captain Underpants and the Perilous Plot of Professor Poopypants

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Captain Underpants and the Perilous Plot of Professor Poopypants is the fourth book in the Captain Underpants series written by Dav Pilkey, published in 2000. The book is about a mad scientist named Professor Pippy P. Poopypants becoming a new science teacher at Jerome Horwitz Elementary. However, all the students laugh at his name.