Oh, no! It looks like George and Harold are in trouble again. . . . As punishment, the boys have to write a 100-page report on "good citizenship," and they have been specifically ordered NOT to make another comic about Captain Underpants. So what do they do? They create an all-new superhero . . . Super Diaper Baby! Super Diaper Baby's archenemy, Deputy Dangerous, wants to steal his powers and take over the planet. Will the diaper-wearing dynamo defeat the deputy, or is the entire Earth doomed?