Captain Underpants and the Revolting Revenge of the Radioactive Robo-Boxers (Captain Underpants #10) by Dav Pilkey

Tra-la-laaa! The Captain is BACK!When we last saw our heroes, George and Harold, they had been turned into evil zombie nerds doomed to roam a devastated, postapocalyptic planet for all eternity. But why, you might ask, didn't the amazing Captain Underpants save the boys from this frightening fate? Because Tippy Tinkletrousers and his time-traveling hijinks prevented George and Harold from creating Captain Underpants in the first place! Now, having changed the course of human history forever, they'll have to figure out a way to CHANGE IT BACK.Could this be the end for Captain Underpants?!!*Strict laydown January 15, 2013!