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.
神谷明
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松島みのり
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はせさん治
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鶴ひろみ
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中島千里
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田中秀幸
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塩沢兼人
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堀秀行
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山本圭子
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岸野一彦
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山口奈々
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蟹江栄司
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