George and Harold, along with Sulu and Crackers, are experiencing an entirely new set of problems when they are trapped in a world filled with opposites. Just imagine the insanity that happens when the pair finds out that they have evil twins, and Captain Underpants's rival is Captain Blunderpants! With B&W illustrations.
- Juvenile Fiction
- Humorous Stories, Action + Adventure / General, School + Education, General, Readers / Chapter Books
- 9-12 years
- August 1, 2006
- Dav Pilkey