After receiving mysterious empty packages inside his apartment, a young computer-programmer (named Simon) begins a personal investigation into their origins. This leads him to discover his odd and eccentric neighbors; an artificially intelligent robot-head, named Adam; a virtual-reality sex game; and a possible corporate conspiracy. As the story progresses, Simon's grip on reality becomes more and more tenuous, while his craving for Nature Fresh milk becomes almost unbearable. Is it all just in his mind, or is something more sinister happening here?

A ship pulls into New York Harbor with no one on board. The police find a cargo full of green pulsating eggs. Upon contact, the eggs explode spreading a green acid like substance that seeps into the skin and explodes. It is later discovered that the eggs are being manufactured in South America by a one-eyed Martian that grew from a tiny seed a former astronaut brought back from a expedition to Mars.

Fifteen years ago, five men were abducted by aliens. Only four returned. Now, these same four men have managed to capture one of the creatures who killed their friend and ruined their lives. It's time for payback but payback swings both ways.

In the year 3000, man is no match for the Psychlo's, a greedy, manipulative race of aliens on a quest for ultimate profit. Led by the seductive and powerful Terl, the Psychlo's are stripping Earth clean of its natural resources, using the broken remnants of humanity as slaves. What is left of the human race has descended into a near primitive state, believing the invaders to be demons and technology to be evil. After humanity has all but given up any hope of freeing themselves from alien oppression, a young man named Tyler decides to leave his desolate home high in the Rocky Mountains to discover the truth, whereupon he is captured and enslaved. It is then that he decides to fight back, leading his fellow man in one final struggle for freedom.

Aliens from Outer Space are slowly switching places with real humans -- one of the first being a young man about to get married...

John Putnam is a writer and an amateur stargazer with a new home out in the beautiful Arizona desert, which he enjoys with Ellen Fields, his girlfriend and a local schoolteacher. John is not trusted by the people of the small town near where he lives, certainly not by Sheriff Matt Warren, who feels protective of Ellen, and perhaps something more. One night, John and Ellen see a meteor crash in the desert. John drags his friend, Pete, out of bed to take him over to the crash site in his helicopter. Once there, John climbs down into the crater. Unfortunately, he does so alone, as Pete and Ellen wait for him. John is the only one who sees the spaceship before a landslide covers it. And John is the only one who catches a glimpse of the hideous thing inside. At first John's story seems mad, until some of the townsfolk begin acting strange - as if they aren't really who they seem to be.

When one saucer of an invasion force has engine trouble, it lands on Earth. It happens to be Halloween and it happens the invaders are only about 4 feet tall. As the bumbling aliens wander around the countryside they are taken to be children and they make friends with two children, one of whom is the daughter of the sheriff. As their troubles mount (it's difficult for five aliens to conquer a world) they begin to give up their plans of conquest, but then there is that nasty killer robot.

Scientists and American Air Force officials fend off a blood-thirsty alien organism while at a remote arctic outpost.

Dr Miles Bennell returns his small town practice to find several of his patients suffering the paranoid delusion that their friends or relatives are impostors. He is initially skeptical, especially when the alleged dopplegängers are able to answer detailed questions about their victim's lives, but he is eventually persuaded that something odd has happened and determines to find out what is causing this phenomenon. This film can be seen as a paranoid 1950s warning against those Damn Commies or, conversely, as a metaphor for the tyranny of McCarthyism (or the totalitarian system of Your Choice) and has a pro- and epilogue that was forced upon Siegel by the studio to lighten the tone.

The sensationalist reporter Michelle Fox presents the TV show Weird World, with phony matters about UFOS and aliens. When she hears about Cat, a young woman that claims that have been abducted with her boyfriend and become pregnant by aliens, she convinces her chief to travel with a team to the remote Welsh island of Scalled to interview Cat. She invites the cameraman Ricky Anderson with his sound technician partner; the nerd expert in "ufology" and "ley lines" Gavin Gorman; the actress Candy Vixen and an obscure gay actor to prepare the matter. They get a van and wait for the low tide to reach the island, and when they find evidences that aliens are really landed in the location, the ambitious Michelle decides to film her way to fame and wealth.

Extra-terrestrials flying in high tech flying saucers contact scientist Dr. Russell Marvin as part of a plan to enslave the inhabitants of Planet Earth.

A few years from now, Earth will have the first contact with an alien civilisation. These aliens, known as Newcomers...