In the fine old tradition of James Marshall's Cut-Ups, Pilkey (God Bless the Gargoyles, 1996, etc.) introduces George Beard and Harold Hutchins, two usually responsible fourth-graders, as in "whenever anything bad happened, George and Harold were usually responsible." Pranksters of the first order, George and Harold are finally nabbed by Mr. Krupp, the principal, whom they then hypnotize into believing he's Captain Underpants, a superhero of their own creation. Before they can stop him, he's out the window in cape and briefs, off to fight crime with Wedgie Power, taking on bank robbers, robot thievesâ€”" 'You know,' said George, 'up until now this story was almost believable!' "â€”and ultimately the evil Dr. Diaper. Distracting Dr. Diaper with some "fake doggy doo-doo," the boys save the planet, then hustle Krupp back into his clothes, just in time forâ€”their next adventure, The Attack of the Talking Toilets, coming soon. Pilkey's stubby black-and-white cartoon figures appear on every page but can be animated in one chapter, thanks to "Flip-O-Rama," where readers flip pages back and forth for the "latest in cheesy animation technology." There'll be no silence in the library once readers get hold of this somewhat classier alternative to Barf-o-Rama books and their crude ilk.