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

Our heroes George and Harold still living as evil zombie nerds.

Captain Underpants was unable to save them as Tippy Tinkletrousers' time-travelling hijinks managed to prevent George and Harold from ever creating the superhero in the first place. Now, after managing to change the course of human history forever, they need to change it back... Will Captain Underpants survive?

Brilliantly funny.