Néstor Varzé is a karate master from the outskirts of Buenos Aires who’s obsessed with samurai history and culture. And although as luck would have it he lives in another time and far away from Japan, he considers himself an heir to those ancient warriors.

Two Vietnam War veterans are sedated and thrown into the sea on the orders of a crime boss. Two sailors put on the veterans' clothes and Colonel Morris confuses them and thinks they are the veterans.

The Dragon is in prison ready to escape and take revenge on those who stopped. This will help a mafia organization that moves in the world of illegal betting related to martial arts fights worldwide and also linked to drug trafficking. In prison, the Dragon is a sinister character, McClain (Randolph McClain), an American imprisoned for killing their opponents. But once released sent to compete in the World Martial Arts Championship with Hector Echavarria, Argentine and world champion wrestler.