During a mission to Mars, astronaut Patrick Ross.(Justin Lazard).is infected by alien DNA. Back on Earth he starts to transform into a terrifying alien entity with a one track mind-to mate with human women and colonise theiworld with his half-alien offspring.
Scientist Laura Baker.(Marg Helgenberger).and ex-military assassin Press Lennox.(Michael Madsen).race against time to stop Patrick. They use Eve.(Natasha Henstridge)., theibeautiful half-alien clone, to lure Patrick, but Eve'shinstinct to mate is too strong and she escapes to procreate with Patrick to create an alien race that spells doom for mankind.