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The stinky scoundrels from international bestsellers THE DAY MY BUTT WENT PSYCHO! And, ZOMBIE BUTTS FROM URANUS! Are back-and determined to wipe away the earth! Zack Freeman (and his butt) have twice saved the world from total reek-dom. But now, the young butt-fighter faces his nastiest challenge yet: Hundreds of thousands of Great White Butts attacking the earth with giant brown blobs are about to cause Buttageddon. In order to stop them, Zack will have to hitch a ride in a time-traveling buttmobile, back to the reign of the prehistoric buttosaurs. Can Zack battle the Tyrannnsore-arses, juggle a giant arseteroid, and put the butts-gone-bad back in their place? Or, will the entire world be, abutterated?