During the Vietnam War, American soldiers Sergeant Kenner (Ahmad Rashad) and Corporal Torres and a South Vietnamese lieutenant blast their way into an underground base and series of tunnels operated by the Viet Cong (VC). They discover a horribly wounded guerrilla, who tells them that the VC tunneled through an old burial ground, and now the dead want vengeance. The VC dies before he can say any more. The men become unnerved and panic as they encounter booby-traps left by the VC, and soon start shooting at everything. But there might be something worth shooting at.