Captain Underpants and the Sensational Saga of Sir Stinks-a-Lot Colour (Book 12)

Captain Underpants returns for a twelfth adventure in this #1 New York Times bestselling 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 tree house and play video games all day – then they switch! But when their malicious gym teacher, Mr. Meaner, creates a method of mind-control that turns their fellow students into attentive, obedient, perfect children, the future of all humanity will be in their hands!