A scientist moves into Dr. Frankenstein's castle to set up his experimental growth ray. When he trains it upon an amoeba, the frightened villagers burst in, and seeing the equipment, think he is going to bring ruin down upon them and hustle him off to the town jail. With no one to shut off the growth machine, the amoeba grows to huge size and smashes out of the castle to menace the village. The scientist escapes his jail cell and uses his labcoat soaked with sugar to lure Sporr into a quicksand pit.
150 Martian flying saucers land on Earth, but do nothing after landing. Since no pilots emerge the natives transport the craft to military bases where their hulls are experimented upon, but cannot be penetrated. At a prearranged signal, all the saucers open a port. The curious scientists and military men enter, but discover no pilot or instrumentation. After they leave, the saucers return to Mars secure in the knowledge that was absorbed from their minds that Earth is no threat to them. The saucers themselves are the Martians.
A gaseous alien comes down to Earth and inhabits a dam of water to harass local villagers. The village loafer realizes that the alien is using the water in the dam to embody itself and steals dynamite in order blow up the pass before the alien can reach the sea. The loafer succeeds, but is imprisoned for stealing the dynamite.
A scientist creates a computer so sophisticated that it can out think human beings. It hypnotizes the scientist into building it a huge robot body so that it can move and threaten human cities to conquer them. As it gets further from the scientist, the hypnosis fades, and the scientist regains his own will. He rushes to Elektro, and enters the robot frame, from a small door in its heel, and removes the power source, thus saving humanity.
A novelist rents a castle in Transylvania, where the locals believe a demon lives. He discovers that the creature is a lost alien child, and its parents cure his limp as a reward for helping it get home.
An Asian tyrant bleeds his subjects dry to build a suspended animation machine and avoid nuclear war. He sleeps for a million years, but when he emerges humanity has abandoned Earth and he faces a harsh and primitive world.
Tiny alien invaders decide to detonate their ultimate bomb thinking that unobserved Earthlings have gone into hiding to avoid their invasion force and end up blowing up an Earth boy's ping pong ball and themselves as they are caught in the aftershocks of the blast.
Colossus [later "It, the Living Colossus"] (introduction, origin); Ivan Petrovski; Boris Petrovski
A Russian dissident is forced by his loyal brother to build a giant statue glorifying the USSR. An alien crash lands and fuses with the statue for protection, animating it and defeating the whole military. The alien’s companions retrieve it and the sculptor claims that the statue was a judgement against dictatorship, frightening the regime.
Googam (introduction, origin); Mark Langley; Helen Langley; Billy Langley (introduction); Goom (flashback)
Goom leaves an offspring in a cave to complete his conquest, and he comes across the family of the scientist who was responsible for his father's defeat. Googam is defeated when the scientist's son challenges him to a game of tag and runs off towards a pool of quicksand and then climbs a tree. When Googam sees the quicksand he mistakenly assumes that it is only mud since the boy must have run across it. Googam only sees the boy hiding in the tree as he sinks into the quicksand.
A communist general demands that the lama tell him of the alien space ship that has landed for repairs. At first the lama refuses to allow the aliens to be conquered by the communists, but he relents after the general threatens to execute all the peasants. The soldiers march off to the mountain the lama has indicated, but after a fruitless search they conclude the lama must have been lying. Suddenly, the mountain begins to shake violently and the soldiers realize too late as it blasts off that the mountain was the space ship.
An American teacher investigates the mysterious statues made by one tribe in Africa, and finds that they worship a native mutated into a monster by a Soviet atomic test. The teacher soothes the man's pain with ointment, but before the American can get him to a hospital he dies protecting his helper from a python.
A mine foreman is concerned that a new robot may take his job, so he scrambles the wires in its control panel. When a cave-in occurs, the men outside contact the foreman by radio and tell him that the robot was not built to work in the mine, but as a safety measure. All he has to do to escape the collapsed tunnel is turn the robot on, but since he has sabotaged the robot's wiring, all he can do is desperately attempt to find the right connections by accident until his air gives out.
A botanist invents a serum to magnify the latent intelligence of plants. He tested it on a remote island, but the plant was evil and wanted to conquer the world. The scientist ran from the plant and used the serum on a more advanced plant, which was benevolent and stopped the evil plant.
A criminal skips town and sets up a newspaper as a front. When his typesetter changes the headlines from what they should read into what actually happens in the near future, he realizes he's got a goldmine, but the typesetter refuses to tell him how he can accurately predict the future. The criminal threatens to fire and blacklist the typesetter if he doesn't come clean, and the next headline he sets tells of an accident happening to the newspaper owner. Panicked, he turns himself in to the police so that he will be safe in jail, which is what the typesetter wanted all along.
Colossus [later called "It, the Living Colossus"]; Crab-Creatures of Cancrius III; Judy; Frank; Charlie; Ben
The crab-creatures of Cancrius III come back to try to take over the earth and begin by taking control of Colossus again. Bob O'Bryan, a scenery designer, comes up with the idea of creating a plaster of paris creature to trick the crab-creatures into taking over. When the crab-creatures foolishly take it over Bob blows it up, destroying them.
Colossus [later called "It, the Living Colossus"]; Bob O'Bryan (introduction, last name not given); Diane Cummings (introduction); Grant Marshall (introduction); Crab-Creatures of Cancrius III; Charlie; Ben
A threatening object that appears to be a bomb drops from the sky and lands in New York city. The object even emits ticking sounds that lead people to believe they are in imminent danger and so the city is evacuated. The military cordons off the object and just waits for its detonation. Eventually the ticking stops and it rises into the air and disappears. It was recalled to its planet of origin because no living thing touched it in response to its signals, and its makers assume Earth is barren of life, so they send their gift package off to another world.