A gunslinger is hired to kill a news photographer. The young ward of the shot photographer discovers the set-up behind the killing - that a laboratory is being set up by a Nazi organization to capture and train talented youth and that the photographer was about to expose it.
While covering a test of guided torpedoes, two reporters believe they see what appears to be a strange-looking swimming creature. They investigate the matter further and discover that there is a race of fish-men living under the sea. The fish-men capture the pair and keep them prisoner in their underwater city.
The legendary empire of the lost continent of Mu reappears to threaten the world with domination. While countries unite to resist, an isolated World War II Captain has created the greatest warship ever seen, and possibly the surface world's only defense.
In 1976, a drifting star named Gorath is discovered to be on a collision course with Earth. Although it is smaller than Earth, its enormous mass is enough to destroy the planet totally. A mission sent to observe Gorath is destroyed after the ship is drawn into the star, with a later mission barely escaping the same fate. However, Astronaut Tatsuma Kanai is left in a catatonic state due to his near death experience. Unable to destroy the invading star, Earth's scientists undertake a desperate plan to build giant rockets at the South Pole to move the planet out of Gorath's path before it is too late.
The murder of the chief official of Kobe city's Customs triggers an investigation of a prostitution ring called the 'Yellow Line' that sells Japanese women. A hired assassin is betrayed by his organization, and kidnaps a woman who happens to be the girlfriend of a newspaper reporter.
The 6th Super Giant film. Although he was believed to be destroyed by the Nazi-like army, Super Giant breaks into the satellite, and a long, riotous battle ensues. (Part 2 of 2)
The 5th Super Giant film. Super Giant pursues a Nazi-like army that operates on a huge satellite in space. The satellite is armed with weapons that could destroy whole cities on Earth from afar. (Part 1 of 2)