What happens when two fourth graders, George Beard and Harold Hutchins, accidentally hypnotize their principal? He turns into Captain Underpants! And that's just the start of the tricks and pranks that ensue throughout this popular series. Dav Pilkey's hilarious Captain Underpants books are a great fit for both readers who are new to chapter books and reluctant readers. Learn more about Dav Pilkey in our guide to the author.