Captain Underpants and the Sensational Saga of Sir Stinks-A-Lot by Dav Pilkey

Captain Underpants and the Sensational Saga of Sir Stinks-A-Lot : Paperback : Scholastic : 9781407138312 : 1407138316 : 05 May 2016 : George and Harold, and their doubles, Yesterday George and Yesterday Harold, have a good thing going. Two of them go to school, while the other two hide in the tree house playing video games -- then they switch! But when gym teacher Mr. Meaner uses mind-control to create obedient, perfect robot children, the future of humanity is in their hands!