Bundle of four Captain Underpants books. Includes: Hardback Book 9 Captain underpants and the terrifying return of tippy tinkletrousers Hardback book 10 Captain underpants and the revolting revenge of the radioactive robo-boxers Paperback book 2 captain underpants and the attack of the talking toilets Paperback book 8 captain underpants and the preposterous plight of the purple potty people