Embittered after a friend's betrayal cost him his Army career, Lee Taylor helps a self-styled militia major hijack an Army shipment. He reaps a deadly reward. The militia, which includes Lee's brother Calvin, expected a missile shipment. Instead, they find a mysterious, sealed cargo and a lone Army Guard. Under threat of death, Captain Teri Washington refuses to reveal the nature of the cargo but warns it is deadly. The major thinks she is lying until an alien lifeform begins a chilling series of attacks. Discipline crumbles and loyalties are tested as the creature stalks its prey with impersonal efficiency.