After escaping from an insane asylum, a medical student assumes the identity of a mysterious dead man, who appears to be his doppelganger, and gets lured to a sinister island ruled by a mad scientist and his malformed men.
Kokubu Masaru (Bunta Sugawara) is a hard-headed, hot-tempered member of a street vendor clan run by an elderly boss (Kanjuro Arashi). They come into conflict with an unholy alliance of evil Yakuza bosses (Watanabe, Amatsu and Kawazu).
