A civilian with strong ties to the military tries desperately to use concrete evidence to convince a high level committee that alien forces are trying to overcome the human race.

A mentally challenged boy named Howie is the last unaffected person in a small town overrun by a strange madness. Miners unearth ancient parasites, in the shape of worms, that attack the brains of their hosts. While the infected townsfolk lose all their inhibitions, Howie must save his sister Sheila, the only person who truly cares for him. Deprived of Sheila's guidance for the first time in his life, Howie struggles to evade his maddened neighbors and destroy the parasites. In the process, he becomes a hero to the whole town.

Aidan Hunter may be the last man on earth after a nuclear holocaust, but he's not lonely. In his subterranean bomb shelter, hes surrounded by his family, friends, lovers, anyone he wants ... Unfortunately, they're holograms -- computer generated people controlled by a beautiful holographic interface named Emma. But when curiosity turns to touch and Aidan makes love to Emma in a virtual reality pod, he quickly learns that trifling with a computers feelings can be dangerous ... and the morning after can be all too real.

It has been three months since the doomsday cult unleashed the genetically engineered Berlin C virus, and today most of the world is dead or dying. Among the living are a group of hospital patients and their nurse, Marie Alexander (Maria Conchita Alonso), who have survived because they were already under quarantine when the virus struck. They are running out of food and fuel when a soldier arrives with a new vaccine from the Center for Disease Control. But, there's only enough for three doses and it will take three days for the vaccine culture to develop enough to be effective. It falls to Marie to maintain order until the vaccine is ready, and to decide who will get injected.

Dr. Larry Chambers (Gregory Harrison) helped build the colony on the Janus Five. He and fellow scientist Amanda Harper (Kimberly Huffman) run computer simulations that show the planet's star will flash over in a matter of days, emitting waves of deadly radiation, so Dr. Chambers urges evacuation. This is not a popular recommendation, especially among the colony's leaders who include council chairman Franklin Murdock (William Atherton), security head Montgomery Bennett (Alan Scarfe) and Amanda's father, Ian Harper (Ken Pogue). They point out that Chambers has been wrong before - the colony had to be moved at great cost after he warned of deadly volcanic activity - and suggest that his judgment has been clouded by the death of his wife Elise. When that doesn't stop Chambers, Murdock and Bennett discredit him by falsely accusing him of being one of the aliens who originally inhabited the planet.

Dlavan (Rene Auberjonois) and his family are Tsal-Khan, offspring of the handful of aliens who remained on Earth after a bitter war of conquest with the human race. Today they live on a tightly guarded farm where they must grow all their own food, since their forebears poisoned all the plants during the war with mankind. Most of the aliens believe that the human race was wiped out in the war, but there is a group of humans in the woods near the farm. This group, is led by Rebecca (Caroline Goodall), escaped from the alien's robot run camps and includes David (Joseph Kell), Ruth (Jane Sowerby) and the mute, orphaned child Tali (Jessica Harmon). They are desperately hungry and have seen their children die from eating poisoned fruit. So, when they spot Dlavan's grandson Ma'al, wandering in the woods, they follow him home to the farm. After they see the well-fed aliens, Rebecca leads the group to raid the farm for food.

Stan Harbinger (Joe Pantoliano) is a top-rated talk show host with a flair for the outrageous and a reputation as a skeptic's skeptic. Assisted by his producer Trudy (Cynthia Nixon), Stan takes special delight in shooting down callers who claim to have alien encounters, especially people like Eldon DeVries (Alan Zinyk), who believes his body has been taken over by aliens. However, when Eldon commits suicide by setting himself on fire in front of Stan, things begin to go wrong for Stan. A plan to syndicate the show is threatened by protests from UFO believers, angry at Stan's role in Eldon's death.

When he was young, Gene Morton killed a man who tried to steal the credit for his brilliant research. Now working on a prison assembly line fixing the busted tape decks of fellow inmates, his chances at parole have been sabotaged by his own honesty and sense of guilt. Although it's a lonely life, late at night, after lights-out, Gene brings out his small friends, a swarm of microscopic machines that he made from prison scrap and keeps in a matchbox.

When Andrew McLaren is fired from his job at Anderson Technology, he suspects that he's being let go because the company president doesn't want to give him credit for his work on the CPS-1200, an as-yet untested time machine. Defiant, Andrew decides to take a trip in the machine. When he reaches his destination, two days in the future, his head is throbbing with a migraine and he is shocked to find that the police are looking for him. Fleeing the lab, he returns home to discover his wife lying in a pool of blood and a man fleeing the scene in a car. Shocked at his discovery, Andrew is determined to use his time machine to change what happened.