Tra-la-laaa! Captain Underpants is back in an all-new epic adventure that's the zaniest, funniest, outrageousest and time-travelingiest yet! In this ninth epic novel, Dav Pilkey takes readers back in time to the carefree days of kindergarten, when the worst thing George and Harold had to face was not evil mad scientists or alien cafeteria ladies but a sixth-grade bully named Kipper Krupp, the nephew of their clueless school principal and because George and Harold don't actually invent Captain Underpants until fourth grade, the two clever kindergartners are on their own using their brains to beat the bully. Hold on to your Underpants the Captain is back!