The plot concerns the black-clad Legion of the Winged Serpent, a rogue group of human-like telepathic aliens led by Captain Rameses (Christopher Lee). The Legion's home planet Alpha in the Orion constellation is about to be destroyed in the imminent supernova of its star, and Rameses is leading a small force of flying saucers to Earth to examine its suitability for their race. Performing several alien abductions, they discover they are descendants of transplanted humans and that the planet is perfect for them. They plan to make way for themselves after killing everyone through the use of a device whose signals prompt people to commit suicide.
The film opens with vague impressions of nature and supernatural forces before centering on a Christ-like figure telling a story to a group of bald pupils, most of whom are children. He tells a story about cosmic forces in conflict. In particular, he warns about the threat of Sateen, an evil inter-spacial force of immense magnitude. The film cuts to The Omni in Atlanta, Georgia where two fictional teams are playing a basketball game. The owner of the Atlanta team, Raymond Armstead (Lance Henriksen), sits courtside and promises an interviewer that the team will win at all costs. Since Raymond is a new owner and the source of his wealth is unknown, the interviewer presses him on the source of his wealth. He eventually answers that the money comes "from God".
As the world awaits the return of a crew of astronauts from a deep space mission, a young woman named Thelma Joyce appears on a television talk show to discuss caves. Soon after her interview begins, Thelma has a horrible psychic vision. After the spacecraft returns to Earth missing its occupants, a girl on a beach discovers a weird, blue, pulsating rock. Her mother soon finds her with her face ripped off.
The film starts from the position close to the literary inspiration suggested in the title, but rather from developing it in the same manner as the novel it is used as a witty commentary on the political situation of Poland in the period of the Polish People's Republic.
Lesley Hahn lives in California, and is plagued by nightmares about faceless telephone repairmen entering her house and taking her. She contacts psychiatrist Dr Neil Chase in hope of receiving treatment for her nightmares.
Intelligent aliens who have been studying Earth for centuries decide to challenge mankind by sending in a 185-foot, laser-eyed monster called Zarkorr to wreak city-crushing havoc. Only one incredibly average young man, postal worker Tommy Ward (Rhys Pugh), can find the beast's weakness and save the planet with the help of a 6-inch-tall pixie (Torie Lynch), who says she is "a mental image projected into his brain" by the aliens. She explains that Zarkorr cannot be destroyed by weapons, but that the key to the monster's destruction lies within the monster itself. Tommy, chosen as an average human, is the one destined to fight Zarkorr, who is programmed to kill him. Tommy asks scientist Dr. Stephanie Martin (De'Prise Grossman) for advice about his mission, but everyone thinks he is crazy. He takes the scientist hostage, but manages to explain his predicament to one of the policemen, who believes him and helps him escape. Dr. Martin agrees to help him. Using computers belonging to a friend of hers, they establish that the monster, which is destroying city after city in the style of Godzilla, neither sleeps nor breathes. Going to the place where the monster first appeared, they come into possession of a strange metallic capsule that fell out of the sky at the time the monster arrived. It is believed to be unopenable, but it opens by itself for Tommy as he touches it. He uses the top of the capsule as a shield, reflecting Zarkorr's laser rays back at him, and the monster dissolves into a small glowing sphere flying into space. Tommy is taken to hospital to recover; a TV reporter congratulates him for saving the world, and he jokes he might run for president.
This film takes place two years after the first film. Zane Zaminski (the protagonist from The Arrival) is found dead in a remote Eskimo community. It is believed that he died of a heart attack. His broadcast to the world about the aliens is believed to have been a UFO hoax due to his dismissal from NASA (this despite Earth continuing to have record temperatures). As his death is announced on TV, five people receive envelopes with details of an alien invasion. This group of five consists of three scientists, Zane's step brother Jack Addison, a computer expert whom he has not seen in seven years, and a reporter named Bridget Riordan. They receive papers talking of global warming and of aliens terraforming Earth into a planet hot like their own dying world.
After his cousin Joe (Stephen Baldwin) dies, Layne Vassimer (A. J. Buckley) and his girlfriend Macy (Callie De Fabry), along with their friends Stephen (David O'Donnell), Maurice (Ransford Doherty), Iris (Kim Onasch) and Katrina (Michelle Borth), decide to clean up Joe's house with the intention of selling it. When they see it for the first time, they discover the house completely covered in plates of iron armor.
The film begins immediately where Species II left off. Hours after the events of the previous film, the medical van transporting the lifeless Eve has lost its way, but when the co-driver tries to radio their superiors, the driver stops and holds him at gun-point. Both are surprised by the alien child (now called "half-breed") appearing in the back window and killing the co-driver with his tongue. In the back the driver finds the half-breed and a reviving Eve, who goes into labor and gives birth to a new-born alien. While the half-breed strangles Eve with his tongue, the driver wraps the new-born in his jacket and runs off through the forest as a military helicopter finds the deserted van. Government agent Wasach orders an autopsy and afterwards the burning of Eve's body.
The film begins with the alien abduction on Scalleum, a remote island off the coast of Wales, of Cat Williams and her boyfriend. Cat's boyfriend is gorily killed through brutal anal probing, and Cat is (also gorily) implanted with an alien fetus. Cat's story attracts the attention of Michelle "Foxy" Fox (Emily Booth), the bosomy host of the cable TV show Weird Worlde, who brings a film crew to the island — her cameraman boyfriend Ricky (Sam Butler); Jack the sound man; nerdy UFO expert Gavin Gorman; and actors Bruce Barton and Candy Vixen (the latter, Foxy's producer assures her, "because she's good, not because she's my girlfriend").
On the surface of Mars, the Mars Rover is destroyed by an unknown source from the planet itself. Astronomer George Herbert (Howell) and his wife Felicity (Van Wyk Loots) are packing for a trip to Washington D.C. to celebrate their 10-year wedding anniversary. George's son Alex tries to spot Mars through his telescope, but actually discovers a meteorite entering Earth's atmosphere. George is called to work about the incident, and his wife and son leave early for Washington without him. As he drives to work, a crashing meteorite disrupts all technology in the area. An alien "walker" emerges from the meteorite and massacres the witnesses with a Heat-Ray, George barely escaping with his life. George decides to meet with his younger brother Matt in Hopewell before moving on to D.C., leaving as the aliens destroy his hometown.
Altered is the story of four men who seek revenge on aliens that abducted them and murdered their friend many years ago. As is explained via dialogue throughout the film, fifteen years before the events shown in the film, a group of five fifteen-year-old friends living in a remote American town were captured and experimented on by aliens while on a hunting trip. Only four of the friends returned alive. The main character (Wyatt) has since distanced himself from his childhood friends and is shown to have decided to live with the past, albeit in apparent constant paranoia. Two of the remaining three characters however have been obsessed by revenge and have persuaded the remaining, somewhat leadable, character that this is the correct course of action to take. The story opens with the tracking and subsequent capture of a lone alien - the consequences of which Wyatt and the three friends soon become deeply involved in.
Rykker is an intergalactic warrior trapped on Earth, constantly fighting a gang of ruthless aliens known as The Syndicate, an alien fifth column plotting to take over the planet. The film opens with a high speed chase, with Rykker killing several syndicate agents.
In 2009, a race of aliens piloting giant robots have conquered Earth and forced humanity to live underground. They have done this by altering the environment, causing constant rainfall and darkness. Over 300 years later, after many generations of living underground, a small group of human rebels plan to finally take back their world from the mechanical invaders. They soon learn however that the aliens do not pilot the robots, but are the robots.
George Herbert explains that despite years of searching for extraterrestrial life, mankind never expected the invasion which devastated human civilization into anarchy, and that the aliens were killed by a lack of immunity to the bacteria in the human blood they consumed. Two years later, a town is seen, populated with silent refugees including characters Shackleford and Sissy. Suddenly, three Tripods land in the city. People are struck by a Heat-Ray. Shackleford takes a sample of Sissy's blood, with which he injects himself.