The tenth epic English novel by Dav Pilkey!

A highly enjoyable picture novel  - brilliant for reluctant readers! The simple black-and-white illustrations on every page furnish comic-strip appeal. Includes several pages of flip-o-ramas that animate the action. 

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.