As the whole world watches the Choujin Rugby game on TV, the "Underground Space Emperor" Hydra King has his Underground Space Supermen kidnap Robin Mask. Their aim is to lure out the Seigi Choujins and then attack them using the Robin Memo, which contains info on all of the Seigi Choujin's weaknesses. Watching on TV all over the world, Kinnikuman and the Seigi Choujins get together and head for Planet Hydra.
| Actor | Role |
|---|---|
 Akira KamiyaNot listed | Not listed |
 Minori MatsushimaNot listed | Not listed |
| SSanji HaseNot listed | Not listed |
 Hiromi TsuruNot listed | Not listed |
 Chisato NakajimaNot listed | Not listed |
 Hideyuki TanakaNot listed | Not listed |
 Kaneto ShiozawaNot listed | Not listed |
 Hideyuki HoriNot listed | Not listed |
 Keiko YamamotoNot listed | Not listed |
 Kazuhiko KishinoNot listed | Not listed |
 Nana YamaguchiNot listed | Not listed |
| EEiji KanieNot listed | Not listed |