Tra-la-laaa! Captain Underpants is back in an all-new epic adventure that's the zaniest, funniest, outrageousest, and time-travelingiest yet! When we last saw our heroes, George and Harold, they were under arrest and headed for prison. Then Harold foolishly uttered the fateful words "What could be worse than going to jail for the rest of our lives?" and changed the course of human history.