Through the tattered remains of a post-apocalyptic civilization, Sgt. Cain and Dr. Bell make their way back from the Center for Disease Control. Their mission to find signs of human life a failure, they are returning to Mt. Bethel; the military research hospital from which they were sent. On their way back, Sgt. Cain and Dr. Bell encounter the remnants of humanity which, through an accidental release of a bio-chemical agent, have transformed into the undead-like "BIOPHAGES".