A new rocket fuel is being developed to power the XF, a jet capable of traveling faster Mach 2. During a test, a craft moving faster than the XF is encountered and the pilot ejects. His report of the event is questioned. An inquiry follows.
Al and Nell Brown are suspicious of their odd new neighbor. Mr. Heller, who claims to be an inventor, uses a robotic vacuum cleaner and a flashlight that shines X-rays. Even so, he's clueless about current technology. Al becomes convinced the couple is from the future, though Nell says her husband's reading too much science fiction.
A strange signal is disrupting the sonar used by bats, causing them to slam into a skyscraper. Fearing a foreign country is tying to disrupt our radar systems, the government investigates. They discover a strong microwave beam aimed at the building from directly above. The inspectors figure it must be coming from a space station in orbit before remembering that signals from earth are reflected by the ionosphere.
The world's leading expert on telepathy, Dr. Lawton, is rushed with his assistant to a military weather station at the North Pole. The men there have suddenly become psychic. The mysterious code they're mentally receiving, Y-O-R-D, turns out to be an SOS call from an alien spaceship in the Earth's orbit.
A Nobel Prize-winning doctor working in rural Arizona is visited by the county health officer after the unusual death of one of his assistants. The secretive scientist is developing a synthetic nutrient that, they learned too late, has an unfortunate side effect: creatures using it become highly susceptible to deadly viruses.
A policeman is recovering from brain surgery. His surgeon was a renowned neuroscientist who has died and his IQ has mysteriously increased. He visits the surgeon's laboratory and recognizes the room and equipment. Visiting the doctor's home, he encounters his widow, who is suspicious that he knows so much about the house and the doctor's work.
An animal researcher finds that his own wife is terrified of animals, and hopes to cure her by teaching her to communicate with them, but an unexpected and more dramatic event may do the trick even sooner.
A man prospecting in the desert finds a sealed experimental container containing two white mice, and brings them home to his wife before calling the authorities. But when the authorities arrive, the two mice are gone, with only a green residue in the container.
Though he looks to be in his forties, the man caught breaking into a research laboratory claims he's over 200 years old. He says he learned the secret formula for youth from the medicine man who raised him. The researchers find him to be sad and lonely, afraid to love someone because she will die of old age while he just keeps going.
A young doctor who's been experimenting with heart surgery is visited by his former teacher. Elderly Dr. Crane's time is short due to his bad ticker. Armed with a newly-developed miniature battery, he hopes to convince the surgeon to use the power source to run an artificial heart he wants implanted in his chest.
Quirky strangers appear at the research institute. They have curious ideas, and unexplained knowledge. Local researchers aren't sure if they are legitimate or if they are dangerous nuts. What will happen if they are allowed into the lab?
A high-strung radar operator is convinced that UFOs are following the test rockets he monitors at a secret facility in Pecos, New Mexico. His kids' new playmate, an odd little girl who feels no pain, causes him to jump to conclusions; he's sure the child and her family are spies from outer space.
The Miami Hurricane Bureau leaps into action when a killer storm mysteriously appears offshore. Besides keeping the public informed of the threat, James Tyler is worried about his son who's on a camping trip with his Boy Scout troop.
After the strange death of Dr Dunlap, Dr Brookes arrives to see if he can complete the research Dunlap was doing into creating water in the desert. Elements of Dunlap's death don't add up and Brookes wonders if he was a lot closer to success than anyone thought.
A Parapsychologist has his funding cut at a college. In a last ditch effort to prove the worth of his research he uses techniques he's developed to try and locate a member of the college staff who has gone missing.
A team of investigators go to Peru after incomplete notes are sent from Dr Hastings. They know he was working on new insecticides to use against termites, but when they arrive at the research station they discover something frightening and revolutionary.
After the death of Dr Keller, researchers going through his notes discover many of his greatest discoveries came from a third party. As they continue to investigate the truth becomes stranger and stranger.
A teacher of the deaf and a truant officer visit an apparently deaf-mute boy to determine why he has not been attending school. The teacher finds that the boy has an uncanny ability to communicate with animals, in spite of his disability.
A doctor discovers a way to reverse degenerate diseases. He experiments on a young woman who makes a complete recovery. He discovers she is beginning to exhibit extraordinary physical abilities, and he realizes he must reverse the process before it is too late.
A break through in rocket design "Project 44" means a team of 8 astronauts are to be selected to go on a mission to Mars. Those planning the project have to deal with the emotional stress of such a voyage along with the obvious physical needs.