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! George and Harold have created the greatest superhero in the history of their elementary school -- and now they're going to bring him to life! Meet Captain Underpants! His true identity is SO secret, even HE doesn't know who he is!