288 pages , Scholastic Inc. , 2016-11-29 A heart-stopping, nostril-burning sequel to the international bestseller The Day My Butt Went Psycho! Find out what happens when butts attack . . . from outer space! The butts strike back! This thrilling sequel to the bestselling The Day My Butt Went Psycho boldly goes where no butt has gone before. It's a heart-stopping, nostril-burning intergalactic adventure, and the fate of the earth itself lies in the balance. Can young Zack stop an invasion of Zombie Butts from taking over the planet? Or is Earth doomed to suffer the tyranny of the stinkiest space invaders this side of Uranus?