Sometime in the future, Earth is recovering from "The Robot Wars" that devastated the planet seven years earlier. Most of humanity now lives on the Moon within a domed city called New Washington, but their survival depends on an anti-radiation drug called Raddic-Q2 which is manufactured on the distant planet Delta 3.
In a distant galaxy, aboard a space station, Princess Belle Star (Sherry Buchanan) approaches her father King Ceylon (Auran Cristea) with her Space Captain, Lithan (James Milton). She advises that their scanners have detected a ship that doesn't belong in their galaxy. The King declares that Oraclon "The King of the Night" (Don Powell) has come to take over his territories. Lithan suggests they put plan Epsilon into action.
Five friends engage in a night of heavy drinking, fighting, and carousing at a club. Hung-over, they drunkenly stumble out of Robin's house, where they crashed for the night, and discover that nobody on their street has mobile phone service or power. They are confronted by an apparently deranged tramp who insists that they are in danger from people with a purple mark. When a city-sized spaceship hovers over Derby, the city begins to panic and society begins to break down. Michael, a lieutenant in the SAS, attempts to lead his friends to safety. He is accompanied by his new girlfriend Carrie, whom he met the previous evening at a nightclub, his best friend Robin, Robin's fiance Dana, and Vincent. They make their way to a store where their friend Pete works, but it is closed. The group rescues an immigrant from angry thugs, and Pete allows the group in through the side entrance. However, a riot breaks out when the crowd sees them gathering supplies, and looters attempt to steal their groceries. Michael frightens off the looters with a pistol, and the friends head back to Robin's house.
John Carter (Antonio Sabato, Jr.) is a modern-day U.S. Army sniper serving in Afghanistan, wounded in the line of duty and used in a teleportation experiment wherein he is transferred to Barsoom, here depicted outside our solar system. On this world, Carter exhibits the ability to leap amazing distances. Initially enslaved and held against his will on a chain and collar by the Tharks, he earns a rank among them and later saves a rival group's princess, the human-looking Dejah Thoris (Traci Lords), from death.
The early part of the film follows the experience of a late 19th-century journalist from Woking, known as "the writer", involved with the landing of a Martian invasion spacecraft. When the crashed cylinder opens, the Martians start killing anything that moves with a "heat ray" weapon. The writer discovers his house is in range of their heat ray and decides to rush his wife and servant to her cousins' home in Leatherhead; once there, he returns in order to return the borrowed cart to its owner, unaware that the invading Martians are now on the move.
Astronauts landing on Venus encounter dangerous creatures and almost meet sexy Venusian women. The astronauts kill a creature that is worshiped by the Venusian women who then attempt to use their powers of nature to kill the astronauts but fail. At last, the astronauts leave the planet and their robot that was burnt by the volcano fire is placed as a god by the Venusian women who have already destroyed the statue of their previous god (a bird).
In ancient Greece, a race of evil aliens from the Moon land on Earth. For years they have terrorized the nearby city of Samar, demanding children for sacrifice in hopes their spilled blood can revive their dead queen. Now, the queen of Samar has made a pact with the Moon men to conquer the world and become the most powerful woman alive. The downtrodden residents of Samar cheer the arrival of the mighty Hercules, who on their behalf faces deadly obstacles, battles the Moon monsters and eventually confronts the leader of the Moon men, Redolphis, a metal-headed giant.
The film begins with the crew of a spaceship seeing explosions in space and asteroids flying by. They are afraid that they are going to be hit, but their ship's computer, named Wiz, tells them that they were seeing the "refraction" of an event that took place millions of years ago. Overjoyed, the ship's crew hug and kiss each other.
The story involves the people of Mars, including Momar ("Mom Martian") and Kimar ("King Martian"). They're worried that their children Girmar ("Girl Martian") and Bomar ("Boy Martian") are watching too much Earth television, most notably station KID-TV's interview with Santa Claus in his workshop at the North Pole. Consulting the ancient 800-year-old Martian sage Chochem (a Yiddish word meaning "genius"), they are advised that the children of Mars are growing distracted due to the society's overly rigid structure; from infancy, all their education is fed into their brains through machines and they are not allowed individuality or freedom of thought.
A spy (Essie Lin Chia) discovers that the Chinese government has created a doomsday device (the "key" to which, "only Chairman Mao has") capable of destroying the Earth and it will be activated in 72 hours. Soon after, Astra – a two year return mission to Venus by the United States Space Program – has its time of launch speeded up and half of the male flight crew are replaced by women shortly before take-off, including one Russian. Shortly before blastoff military alerts are put into effect.
On Life Day, Chewbacca, accompanied by Han Solo, is headed home to see his family. Along the way, the duo are chased by two Star Destroyers, but they escape into hyperspace.
In the year 3000, the space salvage ship Mother III happens upon the derelict transport Demeter. Captain Van Helsing (Casper Van Dien) and his crew board the abandoned ship.
The Southern Sun is a generation ship, or a spacefaring vessel that contains a large number of people, whose mission is to colonize a new world. Its voyage has lasted generations, so many of its inhabitants have been born and will die without ever setting foot on solid ground. This does not please the antagonist, Elijah Kalgan, who conspires with the pirates infesting the nearby Corona Borealis system and the ship’s Chief Engineer MacPhearson. Kalgan hatches a plot to disrupt the Southern Sun’s navigation systems and use the Enforcers, the ship’s police force, to hijack the ship and direct it towards this system. At this point, the inhabitants of the Southern Sun will have no choice but to accept his "generosity".
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.