Jack Breslin, a police officer, investigates brutal murders in which organs have been removed from the victims. Teaming up with Ta'Ra, a beautiful alien medical officer, he learns that the crimes are being committed by a monstrous alien insectoid escaped prisoner known as a xenomorph. Ta'Ra has assorted superhuman abilities, including telepathy and superhuman agility, which come in handy as they track down and destroy the xenomorph.