In 1993, the Search for Extra Terrestrial Intelligence Project receives a transmission detailing an alien DNA structure, along with instructions on how to splice it with human DNA. The result is Sil, a sensual but deadly creature who can change from a beautiful woman to an armour-plated killing machine in the blink of an eye. Government agent Xavier Fitch assembles a team of scientists and mercenaries to locate and destroy Sil before she manages to find a mate and breed.

A murderous TV repairman, Horace Pinker is killing people in a small town left, right and center. He eventually finds the home of Lt. Parker, who is investigating his crimes, and savagely murders Parker's wife, son and daughter. His other son, Jonathan has a strange connection to Pinker through his dreams, and he directs his father to Pinker's business, where a small group of officers enter. Pinker escapes in a horrific spree, killing four officers and then targeting Jonathan's girlfriend, Alison. Another dream leads Jonathan and his dad to a residence where they catch Pinker in in the act of kidnapping. Pinker is arrested after a fight with Jonathan and sentenced to die in the electric chair. When executed, Pinker - who supposedly had given his soul to the devil in exchange for the power to come back as an energy source - takes over people's bodies and continues committing murders...