Kimo has a psychic vision/premonition that Booma gets destroyed in a fight with Bad Inc. Doing the honorable thing, Kimo sets out to protect his big-bottomed bro at all costs (usually to his own peril). Tempting fate, Kimo disguises himself as Booma only to have all of the psychic visions come true upon himself.
Dr. Stinger animates his lunch into a giant, killer dumpling, which terrorizes Generic City. Normally, this would be easy for the Sumos, but Mamoo has a childhood fear of dumplings. Kimo and Booma must get Mamoo to overcome his fear so that they can defeat the giant, floury beast. Panic and dimsum ensue.
Kimo gets promoted to be a higher-ranking Sumotori than Booma and Mamoo. Now, not only honor, but a sumo official dictates that the two lower ranks have to serve Kimo (do his laundry, scrub his back, feed him, etc.) Rank may have its privileges, but when the Sumos can't fight together it makes them much less super duper. Kimo's in a quandary, play by the rules or help his friends.
2003
Dr. Stinger kidnaps Santa Claus and disguises himself as the jolly old fellow to distribute destructive toys to the world. The Sumos don't catch on at first and think Stinger to actually be Santa. But, Prima wises them up and they fight all the nasty toys. Then, freeing Santa from Bad Inc.'s clutches, the Super Duper Sumos discover a previously unknown fact: Santa's a big fat sumo!
Kimo's obsession with miniature golf leads to the discovery that Bad Inc. is attempting to control the minds of kids through a Pizza and Games franchise. The big-bottomed bros leap into action, stopping Bad Inc. and allowing Kimo to achieve the best miniature golf score in the history of the game ... affording him the privilege of wearing the famed, loud, plaid jacket.
Booma gets a job as an underwear model. When Bad Inc.'s monster de jour has really big, butt-slapping hands, Booma refuses to put his butt in harm's way. Kimo and Mamoo must try Booma's patented butt moves in order to fight, but it ends in disaster. Finally, when the monster destroys one of Booma's billboards, Booma becomes a fury unleashed and the big-bottomed bros trounce their foe.