This boxed set showcases the first four books in Dav Pilkey's best-selling chapter book series about the Waistband Warrior and includes a special Captain Underpants whoopee cushion. Overflowing with laughs, adventure, and Wedgie Power, each book also features Flip-O-Rama, the world-famous cheesy animation technique. In addition, Pilkey has created original art for the case, featuring all of the characters from the first four books, making this a collection to treasure.