A group of criminals, led by the ruthless Alexander Ward, hatch a plan to steal gold bars from a bank vault in Deadwood, South Dakota. Ward sends one of his henchmen, Marty Jones, to set an explosion in a nearby gold mine; the detonation will act as a diversion for their heist. Although Marty, accompanied by local barmaid Natalie, succeeds in setting off the explosion, he encounters a beast in the mine. The beast kills Natalie, but Marty escapes with his life.