Captain Underpants and the Revolting Revenge of the Radioactive Robo-Boxers

A world without UNDERPANTS?
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? [...]
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A world without UNDERPANTS?
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?