George and Harold, and their doubles, Yesterday George and YesterdayHarold, have a good thing going. Two of them go to school, whilethe other two hide in the tree house playing video games - thenthey switch! But when gym teacher Mr. Meaner uses mind-controlto create obedient, perfect robot children, the future of humanityis in their hands! Dav Pilkey Captain Underpants & the Sensational Saga of Sir Stinks-A-Lot Book