Yasuaki Sakamoto

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.

Gaira, a humanoid sea beast spawned from the discarded cells of Frankenstein's monster, attacks the shores of Tokyo. While the Japanese military prepares to take action, Gaira's Gargantua brother, Sanda, descends from the mountains to defend his kin. A battle between good and evil ensues, leaving brothers divided and a city in ruins.

Tashiro coincidentally meets his best friend Sugimoto in a bar very close to the apartment in which Sugimoto’s wayward wife is found dead. Although Tashiro is not a suspect in the police investigation, he is racked with guilt and confesses to his wife, Masako. In an effort to further relieve his tortured sense of guilt, he then confesses to Sugimoto. Neither his wife nor his friend can believe that he could have been involved.

In 1980, a giant planetoid named Gorath is discovered to be on a collision course with Earth. Even though it is smaller than Earth, its mass is huge enough to crush the Earth and destroy it. A mission sent to observe Gorath is destroyed after all the orbiting ships are drawn into the planetoid. A later mission is sent to observe and the crew barely leaves before suffering the same fate. However Astronaut Tatsuo Kanai is left in a catatonic state due to his near death experience. The Earth's scientists then come up with a desperate plan to build giant rockets at the South Pole to move Earth out of Gorath's path before it is too late.

In 1965, the space station JSS-3 is destroyed by a fleet of UFOs, which then begin a global siege on Earth, using rays to manipulate gravity and control the minds of men. In response, a global council meeting is held to determine the source of the attacks and prepare a rocket ship armada for a counter-attack, a true battle in outer space. . . The film is a sequel of sorts to Toho's THE MYSTERIANS in the reprise of the Etsuko Shiraishi character of that film as its heroine. It was edited to 74 minutes for its American release.