George and Harold accidentally create a monster in the fifth book in this #1 New York Times bestselling series by Dav Pilkey, the author and illustrator of Dog

Only Captain Underpants can stop the smart, fast, and wicked Wedgie Woman before she takes over the world.

Only Captain Underpants can stop the wickedest, wildest villain yet, Wedgie Woman, who is really Ms. Ribble, a teacher at Jerome Horwitz Elementary school.