Captain Underpants and the Perilous Plot of Professor Poopypants (Captain Underpants #4)

Professor Pippy P. Poopypants may be the greatest scientific genius the world has ever known. Unfortunately, he has such a silly name that nobody takes him seriously! Needless to say, George and Harold poo-poo Poopypants' pride -- practically pulverizing it -- and Poopypants is preparing to pounce! This looks like a job for Captain Underpants...)