Narrator
Inventor Goro Ibuki creates a humanoid robot named Jet Jaguar. It is soon seized by an undersea race of people called the Seatopians. Using Jet Jaguar as a guide, the Seatopians send Megalon as vengeance for the nuclear tests that have devastated their society.
When a rare species of butterfly is found in a mysterious valley in Japan, a pair of entomologists go to investigate and find more. They discover Varan, a giant monster, Who decided to leave the valley and head straight for Tokyo.
Policeman - detective room (uncredited)
Nuclear tests create a radioactive man who can turn people into slime.
Detective in Etsuko's house
In Japan, scientifically advanced invaders from the war-destroyed planet Mysteroid cause an entire village to vanish, then send a giant robot out to storm the city by night, after which they request a small patch of land on Earth and the right to marry earthling women, claiming to be pacifists. Mankind must decide whether to capitulate or to resist.
Mountain searcher (uncredited)
Three competing parties all race against time to track down an elusive creature known only as the Snowman.
(uncredited)
An Ishiro Honda film.
Farmer
A samurai answers a village's request for protection after he falls on hard times. The town needs protection from bandits, so the samurai gathers six others to help him teach the people how to defend themselves, and the villagers provide the soldiers with food.
