Zack becomes obsessed with a new video game where you play as the butt. It‟s strangely kinda awesome. Zack aces the game to the point that he can totally think like a butt. When Zack reaches the end of the game he discovers the villain is Silas Sterne! Soon, the whole town, obsessed with the game, chases Silas out of Mabeltown. And now the Great White Butt has the town to himself and he‟s about to enact his dastardly plan – to use every toilet in town! / Zack and Deuce build themselves a butt buggy. At first they just wanna have fun, but when they find out the bad butts are racing in the Mabeltown Rally, they want in on it too. Why? Because this year, after winning a gagillion years in a row, Silas Sterne and his whole family line have been banned. So Silas, Eleanor, and their fish (go figure) help train Zack to race the race of his life. Hopefully.