The fourth book in Dav Pilkey's mega-bestselling Captain Underpants series, now available in Sound-O-Rama! George and Harold are fourth-grade buddies who love practical jokes. When their latest prank drives their science teacher over the edge, their clueless principal, Mr. Krupp, quickly hires a replacement: Professor Pippy P. Poopypants. Of course, George and Harold can’t resist making fun of the Professor’s silly name. But then the Professor retaliates by forcing everyone in town to change their own names to be equally silly — with colossal consequences! The Captain Underpants series is perfect for listeners of all ages. Like the other outrageously funny books by acclaimed author and Caldecott Honor illustrator Dav Pilkey, this adventure is sure to be hours of fun!