In 2020, after the colonization of the moon, the spaceships Vega, Sirius and Capella are launched from Lunar Station 7. They are to explore Venus under the command of Professor Hartman, but an asteroid collides and explodes Capella. The leader ship Vega stays orbiting and sends the astronauts Kern and Sherman with the robot John to the surface of Venus, but they have problems with communication with Dr. Marsha Evans in Vega. The Sirius lands in Venus and Commander Brendan Lockhart, Andre Ferneau and Hans Walter explore the planet and are attacked by prehistoric animals. They use a vehicle to seek Kern and Sherman while collecting samples from the planet. Meanwhile John helps the two cosmonauts to survive in the hostile land.
The citizens of Tokyo panic when they see UFOs in the sky. The aliens are benign, however, and have come to warn of a meteor on a collision course with Earth. As the meteor approaches, the Earth's atmosphere begins to heat up, and mankind must race to construct a weapon to destroy it.
Demonstrating that a little knowledge is a dangerous thing, a convicted strangler studies the paranormal and finds a way to render himself invisible. Once he escapes, he sets out to find and eliminate the five women who testified in his prosecution. A police lieutenant (Robert Foxworth) sets out to safeguard them, and bring the invisible killer to justice.
Dr. Bill Cortner and his fiancée, Jan Compton, are driving to his lab when they get into a horrible car accident. Compton is decapitated. But Cortner is not fazed by this seemingly insurmountable hurdle. His expertise is in transplants, and he is excited to perform the first head transplant. Keeping Compton's head alive in his lab, Cortner plans the groundbreaking yet unorthodox surgery. First, however, he needs a body.
It is prior to the commencement of World War II, and Japan's fiendish Black Dragon Society is hatching an evil plot with the Nazis. They instruct a brilliant scientist, Dr. Melcher, to travel to Japan on a secret mission. There he operates on six Japanese conspirators, transforming them to resemble six American leaders. The actual leaders are murdered and replaced with their likeness and Dr. Melcher is condemned to a lifetime of imprisonment so the secret may die with him.
In the 22nd Century, Ray Peterson, reporter for the Interplanetary News, is assigned to write a story aboard a space station. Tension mounts between Peterson and the station's ommander, who think he's in the way, but has orders to leave him alone. Errant spaceship, Alpha Two enters the solar system and its photon generators are radiating enough heat to destroy Earth as it approaches. It falls to Peterson to try to figure out a way to enter the spaceship, disarm the generators, and escape before suffocating.
Spies discover that the Red Chinese have built a "doomsday machine" capable of destroying the surface of the Earth, and that they plan to use it within a matter of days. Meanwhile, Project Astra, a manned U.S. space mission to Venus, is in its final hours before launch when it is taken over by the military and nearly half of its all-male crew is replaced by women. The reason for this becomes apparent when, shortly after Astra leaves orbit, the Earth is completely destroyed in a global cataclysm! Is the human race doomed? What dangers and wonders await the crew of the Astra on their journey to Venus?
Ev, along with her husband, Harold, and their lawyer friend Martin, are scuba diving while on vacation in Puerto Rico. When they resurface, they gradually conclude that an unexplained, temporary interruption of oxygen has killed everyone on the island... maybe even the world.