Deuce is fooling around in Silas Sterne?s weapon room. He and Zack had just finished a conversation about trust. And then Deuce goes and turns on a weird butt fighting orb that causes them to switch bodies! Zack is now Deuce and Deuce is now Zack. And oh, tonight just happens to be the Spanky Awards where Zack is up against Eleanor for butt fighting rookie of the year. Ehn, it?ll probably be fine. He can trust, Deuce, right? / Harmony Day is the one day of the year where all humans and butts come together in the spirit of peace and togetherness – to squash someone! One unlucky human or butt will wear the golden plunger atop their head and roam through the streets until sundown, hiding from the entire town. And Deuce, totally misunderstanding Harmony Day, stuffs the ballot box with only his name so he?ll “win.” Now Zack has to protect his pal from the entire town, including the Harmony Day champion, Silas Sterne.

Zack and Eleanor have been kicking butt all over town. But a mysterious figure named the Dark Nugget has been swooping in and stealing all their glory. He doesn‟t do anything, but he‟s always there at the right time. Soon, he, along with Zack and Eleanor are captured by the Great White Butt. They unmask the Dark Nuggets as – ugh, Jonas Heinie, Zack‟s spoiled neighbour. Now they‟ve got to work together to escape. / Zack, Deuce, and Eleanor have made it to the best of three Dodgebutt championships. But in the first match of the finals, Deuce goes psycho and nearly blows the whole thing! Frankly, he‟s been going psycho a lot lately. Zack and Eleanor take him to a yogi to Zen Deuce out, but it works too well. And on Eleanor too. Now they‟re both so chill that they don‟t even notice they‟re in a Dodgebutt game.

Every butt fighter had an animal sidekick it seems. So Zack wants one too. And when he and Deuce accidentally defrost a Dinosaur he figures why not him? But, it turns out having slow, giant dino around stinks. And so they ditch him and instead detach his butt. Who is awesome! The guys go have a great time with him until they give him a bag of Cheekburger burgers. Soon, the Buttasaurus develops a taste for Cheekburger secret sauce and goes on a terrifying rampage. Whoops./ The Mabeltown Butt Menace Meter breaks and the whole town, especially Eleanor, freaks! But Zack says not to worry. From years of hanging with his butt, he‟s honed his In-stink. He knows what the butts are gonna do, any time, any place. Soon, that power goes to his head as all of the townsfolk believe he‟s some sort of seer. But when it blows up in his face, suddenly no one believes him anymore. Y‟know, right when the Great White Butt is about to invade.

The Great White Butt is down in the dumps; abandoned by his loyal followers and unable to win a single fight, Gran takes pity on him and invites him into her house – to room with Zack and Deuce. And it sucks. Big time. So much so that Zack has no choice but to help the Great White Butt get his mojo back so he can get him out of his house and give the now-bored butt fighters something to do. / Thanks to a super static electricity charge, Deuce sucks all of the power out of Mabeltown and into his body. It?s a city wide black out. Zack and Deuce have all sort of fun, powering things up using Deuce?s touch. But soon they learn that the Great White Butt has created a giant laser thingamajig and has evil, evil plans to take over the town. And the battery he needs to power it is the exact size of the glowing Deuce.

Zack and Deuce go on a TV talk show where they learn that they were switched at birth with none other than spoiled rich kid, Jonas and his butt, Jack. Ugh. But Zack wants to get to know his “real” butt and so the guys swap places, each hanging with their new bestie. But Zack's new butt, Jack, starts to get weirder and weirder, Single White Butt-style. Soon, Zack learns it‟s all just a con and the butt belongs to neither of them. /The one and only Bummy Rippa is coming to Mabeltown to shoot a movie! Of course, it figures that the movie is about, ugh, the Dark Nugget, Jonas‟s faux super hero persona. It‟s basically the best/worst day ever. Zack and Eleanor compete to be an extra, but wouldn‟t ya know it, Jonas‟s Dad simply buys him the role. The kids sneak on to the set, only to have it attacked by the Great White Butt who‟s displeased at the way he‟s written in the script. But Bummy doesn‟t realize it‟s an attack and so the kids have to save the day!

Deuce bumps his head one too many times and winds up with amnesia. Not only does he not know who he is, but he doesn't even know he's a butt! Eleanor decides this is the perfect opportunity to create Deuce 2.0, but Zack just wants his bud back. They scramble back and forth, each trying to remake Deuce. But neither of them notices they've left Deuce sitting in front of the TV watching a Bummy Rippa movie and suddenly – Deuce now thinks he's a butt fighter! And he's pretty awesome at it too! In fact, soon, Silas invites him to join the B-Team. Now, Zack and Eleanor need to switch Deuce back before he steals their rightful place in the greatest buttfighting squad of all! Thanks to one of Deuce's psycho episodes, Zack winds up with a face that looks like a butt! And lo and behold, he (and Deuce) get invited into a top secret, butts-only club, the famed Skull and Bums. It's the stuff of legends. Eleanor and the butt fighters have wondered about the rumours for years and now – Zack is in! And he gets to see what butts act like when no one is around (it's not pretty). Soon, Zack's swelling goes down and he and Deuce must find ways to re-create his 'butt face' and get back in. And when he does, he needs to find out just what the butts are up to. Eleanor says there's an evil plan. So there must be.