Captain Underpants #5: Captain Underpants and the Wrath of the Wicked Wedgie Woman by Dav Pilkey (Paperback)

George and Harold are having a normal kind of week. Yesterday they found out they were going to flunk fourth grade. Today they've created an evil, super-powerful monster. The Wicked Wedgie Woman is on a mission to take over the world ... and she'll give a whopping wedgie to anyone who stands in her way! Watch out!