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.