Captain Underpants by Dav Pilkey

This book is about two kids names George, Harold, and Captain Underpants. So when George and Harold bought a hypno ring and turned their principal Mr. Krupp into Captain Underpants and they had to fight a battle named Dr. Daiper who is a villain and his robot minions too.Captin Underpants is sling shotted his underwear at Dr. Daiper and hanged him on a pole and put a sign on him that said arrest me.