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 usually RESPONSIBLE kids . . . whenever anything bad happens, George and Harold are usually responsible! And it looks like they're up to their old tricks again! First, they ruined the school's science fair with a series of silly pranks. Then, they accidentally created an army of evil, vi