George and Harold have been ordered to stop making comic books about Captain Underpants. So the boys put their creativity to work and invent an all-new superhero instead. Super Diaper Baby is faster than a speeding stroller, more powerful than diaper rash, and able to leap tall buildings without getting a wedgie! Now, Deputy Dangerous wants to steal Super Diaper Baby's powers and take over the …
George and Harold have been turned into evil zombie nerds doomed to roam a devastated, postapocalyptic planet for all eternity! Unfortunately, the boys can't count on Captain Underpants for help because Tippy Tinkletrousers and his time-travelling hijinks prevented George and Harold from creating him in the first place! With Tippy having changed the course of human history forever, George and H…