When George and Harold hypnotize their principal into thinking that he is the superhero Captain Underpants, he leads them to the lair of the nefarious Dr. Diaper, where they must defeat his evil robot henchmen. George and Harold have created the greatest superhero in the history of their elementary school, and now they're going to bring him to life! Meet Captain Underpants! His true identity is so secret, even he doesn't know who he is. Acclaimed author and Caldecott Honor illustrator Dav Pilkey provides young readers with the adventure of a lifetime in this outrageously funny, action-packed, easy-to-read chapter book. With hilarious pictures on every page, 'The Adventures of Captain Underpants' is great for both beginning and chapter-book readers. And, like Dav's other best-selling books of humour, it is sure to provide even the most reluctant readers with hours of fun.