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.
Shipwreck survivors found on the presumably uninhabited Infant Island leads to a scientific expedition that discovers a surviving native population along with the Shobijin, tiny twin fairy priestesses of the island's mythical deity called Mothra. After the fairies are kidnapped by an exploitative businessman named Clark Nelson, Mothra sets out to rescue them.
A nameless ronin, or samurai with no master, enters a small village in feudal Japan where two rival businessmen are struggling for control of the local gambling trade. Taking the name Sanjuro Kuwabatake, the ronin convinces both silk merchant Tazaemon and sake merchant Tokuemon to hire him as a personal bodyguard, then artfully sets in motion a full-scale gang war between the two ambitious and unscrupulous men.
Yuzo Kayama plays the protagonist, a whale-hunting cannon manufactuing supervisor, whose brother is an automobile tester for Komatsu Motors which has a fatal accident. As his brother investigates the "Accident" with his old college friend (makoto Sato), now a reporter... They stumble across murder, espionage and cover-ups. High-class night club, femme fatale, and a "Blueprint of Murder" all adds up to a bigger plot then first expected.
Japanese police detective Saburo Fujioka is suspected of corruption, demoted, and sent to the city of Kojin. Kojin is the scene of fierce fighting between rival gangs. Fujioka is assigned to investigate the death of the wife of gangster Tetsuo Maruyama of the Kozuka gang, probably at the hands of one of the Oka gang. During a gang gunfight, Maruyama is rescued by Detective Fujioka and the two become friends. But Maruyama insists on avenging his wife's murder, even if it means conflict with his new friend.