Two Captain Underpants books by author David Pilkey. The paperback book is the first in the Captain Underpants series, “The Adventures of Captain Underpants.” The hardback book is the ninth book, “Captain Underpants and the Terrifying Return of Tippy Tinkletrousers.” These books humorously illustrated, and the hardback book has full color illustrations (see photos). These books are great for BOYS and GIRLS! Books are in great used condition. Sell new for $9-$13 each.