Kinnikuman: Counterattack! Hidden Space Superman (1985)
Original title: キン肉マン 逆襲！宇宙かくれ超人
Kinnikuman: Counterattack! Hidden Space Superman is a 1985 Japanese-language animation movie directed by Yasuo Yamayoshi, with a running time of 39m. It stars Akira Kamiya, Minori Matsushima and Sanji Hase.
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.