Kinnikuman: Kessen! Shichinin no Choujin tai Uchuu Nobushi
Japanese title: キン肉マン 決戦!7人の超人vs宇宙野武士
Type: TV Special
Episodes: 1
Source: Manga
Genres: Comedy, Sports
Studios: Toei Animation
Duration: 1 hr 12 min
Rating: PG-13 - Teens 13 or older

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.

(Source: Kinnikuman Wiki)