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 are in a STICKY situation. Their latest prank has SNOTTY school brainiac Melvin Sneedly seeing red, and he can't wait to get them back. But when Melvin tries to transform himself into a bionic-powered superboy, things get a little gloppy -- and the Bionic Booger Boy is born! Can Captain Under