Tra-la-laaa!! The NEW YORK TIMES and USA TODAY bestselling Captain Underpants series is now available in ebook edition, featuring Flip-E-Rama, bonus content, and more! He defeated the diabolical Dr. Diaper . . . He terminated the terrible talking toilets . . . Now he's in for the fight of his life. Can Captain Underpants and his drawers hold up under the pressure from three massive, tentacled space aliens (in disguise) who are on a mission to enslave the whole planet? It's time to probe a little further and find out in this WEDGIER alien adventure of Captain Underpants!