There is a Robot Hamster Fighting contest in town and Robo-Joe has been entered to compete! There is however a new mysterious contestant from America to also fight in the contest. As they get to the competition, the Ham-Hams train Robo-Joe up to fight better than he could as they have seen this mysterious fighter and their power. Kana, Laura and her grandpa all search for Robo-Joe as they belive he has gone missing. After witnessing him jump, Hamtaro asks Maxwell to develop a special move for Robo-Joe to use in the fight. Robo-Joe then returns to the stadium, ready for the fights!