Kinnikuman: Gyakushuu! Uchuu Kakure Choujin

In the midst of a globally televised Choujin Rugby match, the nefarious Hydra King, known as the "Underground Space Emperor," orchestrates a sinister plan by abducting Robin Mask. This cunning move is designed to draw out the Seigi Choujins, using the Robin Memo—a crucial document detailing the vulnerabilities of these heroes. As the tension heightens, Kinnikuman and his fellow Seigi Choujins rally together, determined to rescue their comrade and confront the threats posed by Hydra King and his Underground Space Supermen.

With the stakes raised, the team embarks on a daring journey to Planet Hydra, where they must face formidable challenges and utilize their unique skills in an effort to thwart their enemy's malicious scheme. The blend of sportsmanship and combat underscores the camaraderie and resolve of the Seigi Choujins as they navigate both the excitement of the game and the perils of their mission.