Captain Underpants and the Sensational Saga of Sir Stinks-a-Lot

In the twelfth installment of the Captain Underpants series, 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 treehouse and play video games all day—then they switch! But when their malicious gym teacher, Mr. Meaner, invents a method of mind control that turns their fellow students into attentive, obedient children, the future of all humanity will be in their hands!