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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.

Ooabare! Seigi Choujin is a 1984 Japanese animated film. It is the second theatrical film based on the anime series Kinnikuman. It was released in Japan on December 22, 1984 alongside Dr. Slump and Arale-chan: Hoyoyo! The Treasure of Nanaba Castle and Uchuu Keiji Shaider: Follow the Shigishigi Kidnapping Gang!. It is set after the Seven Akuma Choujin Arc. It was the first movie to feature the character Buffaloman and was the first of only two films to feature the Announcer (the other being Crisis in New York!). It is the first anime appearance of Bibinba, who appears as Kinnikuman's fiancee in the original manga.

Terryman, Robin Mask, and the other Justice Choujins are participating in a tournament in New York. Suddenly, Akuma Shogun (not the same as the guy from the series) arrives and defeats all of the Justice Choujins and absorbs their power... all except Kinnikuman (who was late for the tournament because he was busy eating gyuudon). Now Kinnikuman must defeat Akuma Shogun, whom now posseses the combined strength of all the Justice Choujins.

Kinnikuman has proven himself worthy to be crowned the next king of Planet Kinniku. But at the ceremony, five other Kinnikuman's arrive, all claiming to be the true prince of Planet Kinniku. Now, a Royal Survivor Tournament is being held to decide the true successor to the throne, and with the help and support of his friends and with his recently acquired knowledge of the Ultimate Technique (The Muscle Spark), Kinnikuman fights for what is rightfully his.

A TV Special first aired in 1984. It covers the Planet Rakka story arc and takes place after the 21st Choujin Olympics Arc. A young boy from Planet Rakka named Beansman asks Kinnikuman and the others to help save his planet from the Space Samurais led by Black King. The story was a parody of The Seven Samurai.