In the all-new epic adventure from Dav Pilkey, George and Harold travel through time to save Captain Underpants and the world from certain destruction! Captain Underpants and the Revolting Revenge of the Radioactive Robo-Boxers By Dav Pilkey http://www.pilkey.com/ or http://www.scholastic.com/captainunderpants/books/author.htm Children/teachers/parents/humor