Meat-kun has been kidnapped by Iron Mask. In order to save Meat-kun, the treasure of Inmora Island is needed. Furthermore, the treasure is hidden in the Seven Story Tower, which is guarded by the brutal Senshi Choujins. When Kinnikuman asks Terryman and the Seigi Choujins to help him, for some reason they all refuse. Alone, Kinnikuman heads to Inmora Island to fight the Senshi Chōjin and is overwhelmed by their great numbers.
Seigi Choujin vs. Senshi Choujinis the seventh and final theatrical film based on the anime series Kinnikuman. It was released in Japan on December 20, 1986 alongside GeGeGe no Kitarou: Crash!! The Great Rebellion of the Multi-Dimensional Youkai and Dragon Ball: The Legend of Shen Long.
This movie was loosely based on Yudetamago's manga, Death Game, which itself was based on the Bruce Lee movie, Game of Death.
The character Neptuneman appeared in the original manga and anime as the main antagonist of the Dream Choujin Tag Arc. Seiyu Chikao Otsuka returns as one of the main antagonists of this film, having previously played that role in The Stolen Championship Belt.