In the winter of 1982, a twelve-man research team at a remote Antarctic research station discovers an alien buried in the snow for over 100,000 years. Soon unfrozen, the form-changing creature wreaks havoc, creates terror... and becomes one of them.

When some very creepy things start happening around school, the kids at Herrington High make the chilling discovery that confirms their worst suspicions: their teachers really are from another planet!

A parasitic alien soul is injected into the body of Melanie Stryder. Instead of carrying out her race's mission of taking over the Earth, "Wanda" (as she comes to be called) forms a bond with her host and sets out to aid other free humans.

A group of toy store employees must protect each other from a horde of parasite infected shoppers.

The Lunar Base Ark explores ore and unexpectedly is hit by a meteor shower and has severe damages. Colonel Gerard Brauchman sends the crewwoman Ava Cameron to repair a wing that is full of CO2. Dr. Lance Krauss warns that the gas may cause paranoia and hallucinations. Ava brings a sample of the meteor for analysis and Dr. Krauss finds that there are spores attached to the meteor. Ava accidentally cuts her finger in a sample but she hides the cut from the doctor. Soon Ava gets pregnant and delivers an alien offspring. However, neither Col. Brauchman nor Dr. Kraus believes in her words and they believe that Ava is delusional. He offspring bites the crewman Bruce Johns and the crew discovers that Bruce has been cloned by the alien. Soon they find how dangerous the clone is.

When a meteorite touches down in the New Jersey woods carrying a monstrous alien slug, it’s up to four teens to stop it before it’s terrifying brood consumes all life on Earth!