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

In this comedic children's book, George and Harold have been turned into evil zombie nerds in a postapocalyptic world, and Captain Underpants is nowhere to be found. The duo must figure out how to correct their time-traveling mistake and save their hero before it's too late. Full of hilarious hijinks, this book is a must-read for fans of Captain Underpants.