Royal Air Force pilot Lt. Kate Sinclair is on her final flight mission when her jet is shot down over one of the most dangerous rebel strongholds in Afghanistan. She finds refuge in an abandoned underground bunker where deadly man-made creatures known as Ravagers — half-human, half-alien, and hungry for human flesh — are awakened.
A scientist, Dr Holander, takes his niece Miranda to Mexico in an attempt to reverse the effects of the alien DNA he used to create her. However the treatment goes horribly wrong, and sets Miranda on a killing spree as she sets out to find a mate.
Having just returned from a mission to Mars, Commander Ross isn't exactly himself. He's slowly becoming a terrifying alien entity with one goal -- to procreate with human women! When countless women suffer gruesome deaths after bearing half-alien offspring, scientist Laura Baker and hired assassin Press Lennox use Eve, a more tempered alien clone, to find Ross and his brood. Before long Eve escapes to mate with Ross.