Kinnikuman: Gyakushuu! Uchuu Kakure Choujin

During a globally broadcasted Choujin Rugby match, the "Underground Space Emperor" Hydra King orders his Underground Space Supermen to capture Robin Mask. Their plan is to draw out the Justice Choujins and use the Robin Memo, which holds details about each of their weaknesses, to attack them. Kinnikuman and the other Justice Choujins, watching the event on television, gather and travel to Planet Hydra in response.