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.
Practical Effects
Hand-drawn muscle physics that defy anatomy and gravity simultaneously.
Writing
"Robin Memo" as a plot device — villainous note-taking elevated to epic stakes.
Director
Yasuo Yamayoshi
Trivia, insights & behind the scenes
This was the fourth Kinnikuman theatrical short, rushed out during the anime's peak popularity — explaining the 39-minute runtime and fever-dream pacing.
Kinnikuman's 'kinniku' (muscle) humor and ugly-cute hero design directly influenced decades of comedy anime, from Bobobo-bo Bo-bobo to One Punch Man's Saitama expressions.
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