When God Von Erich announced a tag tournament between the World Supermen Association, Council, and Federation for control of the American Chojin world, Jean Steamboat was called in from France to be Beauty Rhodes' tag partner on The Emperors' tag team. In the first round of tournament, the Emperors fought against The Machineguns, Kinnikuman and Terryman of the WSA.
Despite having the advantage at first, mainly due to Kin's lack of experience in tag matches, the match ended in a draw. In the second round, he and Rhodes fought against the Blood Illusions, Skull Bozu and Devil Magician. The Emperors were hospitalized when Most Violent Combo began to cheat, starting with Rhodes being set on fire by Skull, and Devil Magician stabbing Steamboat with a hidden knife. They were able to recover in time to give Terryman his artificial leg back when he lost it during the Machineguns' match against the Blood Illusions.
After Kinnikuman's eventual victory in the American Tour Arc, God Von Erich declares that a tag-tournament will determine which organisation will control the USA.  Beauty Rhodes is introduced to Jean Steamboard at New York Airport.  They enter the ring for the opening ceremony of the tournament, where they insult The Machineguns, only to later engage in a free-for-all brawl with all the other teams.  Their first official match is declared to be against The Machineguns. 
Jean Steamboard starts with an advantage, while Beauty Rhodes focuses upon Terryman. Terryman forces Kinnikuman out of the ring, as he tries to fight alone primarily against Rhodes, but Kinnikuman eventually fights alongside him and the two teams are evenly matched. Kinninkuman accidentally knocks out Terryman.  The Machineguns are unable to finish their attack before the end of the 60 minutes time limit, and this causes the match to end in a draw. 
After driving to their next match destination, The Emperors decide to shower with Edith Harrison.  The next match is against Blood Illusions; the match is even in skill, until Devil Magician throws gasoline over Beauty Rhodes and Skull Bozu light him aflame.  The Blood Illusions then throw daggers at Jean Steamboard, until Edith Harrison gives up the match on their behalf - they continue to attack. After Terryman and Meat Alexandria come to their defence, all four men are left in a bloody mess upon the ring by the Blood Illusions.  The Emperors are later seen again when Terryman lose his leg in The Machineguns vs. Blood Illusions, as they retrieve his leg from Kinkotsuman and return it to him. 
He participate in the 21st Chojin Olympic alongside the other Justice Chojin, but he gets eliminated at some point during the prelims.
Alongside with the rest of Justice Chojin, he has to stay inside one of the life support bubbles generated by the Silver Mask. During the final showdown between Kinnikuman and Akuma Shogun, he and the rest of the chojin in the life support bubbles were transported under the ring.
Jean Steamboat was one of the many Justice Chojin that traveled to Osaka Castle to cheer up for Kinnikuman in his final fight with Super Phoenix.
Win/Loss Record (Tag-Team)
- He never appeared in the anime, because the American Tag Tournament was completely scrapped for the anime.
|Brocken Jr., Buffaloman, Geronimo, Kinnikuman, Robin Mask, Terryman, Warsman, Wolfman,|
|Chaos Avenir, Gazelleman, Kevin Mask, Mantaro Kinniku, Seiuchin, Terry the Kid|
|Bibimba, Fiona, Jacqueline Muscle, Okan, Sayuri Kinniku|