There's a tiny new superhero in town. Undaunted by Principal Krupp's insistence that their essay assignment on good citizenship not be another comic book about the briefs-clad warrior, fourth graders George and Harold decide to invent a new superhero. Super Diaper Baby is born! It's up to our fearless infant hero to save the planet from diabolical Deputy Doo-Doo and his reluctantly evil pooch, Danger Dog ("I'm not really evil. I'm just in it for the kibbles."). Several robotic battles, intergalactic digressions, and "flip-o-ramas" later, Super Diaper Baby has done his duty, and George and Harold are in trouble yet again with their principal.