CU and the Revolting Revenge of the Radioactive Robo-Boxers (Captain Underpants)

When We Last Saw Our Heroes, George And Harold, They Had Been Turned İnto 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 İn The First Place! Now, Having Changed The Course Of Human History Forever, They'll Have To Figure Out A Way To Change It Back.