Astronauts Glenn and Fuji investigate Planet X and encounter mysterious aliens known as the Xiliens, who ask Earth's people to help save their world from "Monster Zero". In exchange for borrowing Godzilla and Rodan, the Xiliens offer a cure for cancer. As Glenn investigates, he develops a romance with Miss Namikawa and uncovers the Xilien's true intentions.

A group of friends try to find success in corporate Japan.

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.

In this loose adaptation of "Hamlet," illegitimate son Kôichi Nishi climbs to a high position within a Japanese corporation and marries the crippled daughter of company vice president Iwabuchi. At the reception, the wedding cake is a replica of their corporate headquarters, but an aspect of the design reminds the party of the hushed-up death of Nishi's father. It is then that Nishi unleashes his plan to avenge his father's death.

Nuclear tests create a radioactive man who can turn people into slime.