Captain Underpants and the Revolting Revenge of the Radioact, Paperback/Dav Pilkey

A 10th adventure for Captain Underpants, as George and Harold realise that Tippy Tinkletrousers has travelled back in time and prevented them from creating Captain Underpants! Can they change the course of history back, and reunite with their hero? 2 million copies of }Captain Underpants{ books have been sold in the UK alone. Ages: 7+