The Adventures of Super Diaper Baby is an American children's novel by Dav Pilkey (credited as "George Beard and Harold Hutchins"), categorized as part of the author's Captain Underpants series of books as a spin-off to the series. It was published on February 5, 2002. Plot Introduction Fourth graders George Beard and Harold Hutchins skate over ketchup packets in the school gym until their rude-spirited principal, Mr. Krupp, forces them to clean up the mess and meet him at his office. Since writing a sentence over and over wouldn't teach the boys anything, Mr. Krupp assigns them to write a 100-page essay on good citizenship, which they can't turn into a Captain Underpants story. The boys promptly make a story with a new superhero called "Super Diaper Baby", which angers Krupp to the point of making them write sentences. Main plot Expectant couple Bill and Mary Hoskins rush to the hospital while Deputy Dangerous and his talking pet dog Danger Dog drain Captain Underpants of his superpowers with Deputy's fitted ray, which then converts it to a liquid the two would consume, but Danger only drinks half of it when the police arrives, whom they both evade. Back at the hospital, Mary gives birth to a boy named Billy, whom the attending doctor accidentally throws into the power container. Billy drinks the juice, gaining the super powers and he overpowers both Deputy Dangerous and Danger Dog, both of whom are then apprehended by the police. Billy then flies back to the maternity ward. Danger Dog and Deputy Dangerous escape prison to their secret lab, where the latter invents a crib device connected by satellite that they deliver to the Hoskins under euphemistic pseudonyms, "Deputy Un-Dangerous" and "Safety Dog". Billy poops before midnight, and Mary gives him a very nice bath just as the "Heat-Seeking Dish" turns on. The device transits the poop, turning Deputy Dangerous into a small piece of turd. The next morning, Deputy Dangerous invents the "Robo-Ant 2000" so he can take over the world, but Danger Dog coins the name "Deputy Doo-Doo", then changes signs around. Billy fights the robot, but is taken by Deputy Doo-Doo to a nuclear power plant. Danger Dog saves Billy, while the Ant falls into the power plant instead. Bill and Mary want to keep "Safety Dog", but the Landlord worries that Danger Dog might stain the carpet, but changes his mind