When we last saw our heroes, George and Harold, they had been turned
into evil zombie nerds doomed to roam a devastated, post-apocalyptic
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 this
time-travelling 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?