A massive underwater volcano erupts and puts a group of investigative scientists in danger. They are rescued by an atomic super submarine named The Alpha under the command of Captain McKenzie. The group is quickly taken to a vast underwater city known as Latitude Zero, a fantastic, Atlantean type utopia, a world beneath the ocean with its own sun. It is soon discovered that Captain McKenzie is at war with the evil Dr. Malic, a cruel scientist who wishes to rule mankind all the while conducting genetic experiments on humans and animals. Malic sends his agents to kidnap Dr. Okada, a human scientist who has created a serum that can immunize exposure to radiation.

A Muslim ambassador exiled from his homeland joins a group of Vikings, initially offended by their behavior but growing to respect them. As they travel together, they learn of a legendary evil closing in and must unite to confront this formidable force.

Two New York cops get involved in a gang war between members of the Yakuza, the Japanese Mafia. They arrest one of their killers and are ordered to escort him back to Japan. However, in Japan he manages to escape, and as they try to track him down, they get deeper and deeper into the Japanese Mafia scene and they have to learn that they can only win by playing the game—the Japanese way.