Captain Underpants #4 : Captain Underpants and the Perilous Plot of Professor Poopypants - Paperback

Tra-la-laaa! He's a caped crusader who dresses in jockey shorts. He battles evil with "Wedgie Power"—and always wins! He's Captain Underpants—a sensational superhero and the star of four terrific books. In his latest adventure, Captain Underpants and the Perilous Plot of Professor Poopypants, the kooky crime fighter takes on Professor Pippy P. Poopypants, a mad scientist who shrinks Jerome Horwitz Elementary School—and is determined to take over the world.