During a wild weekend in Las Vegas, four young friends get into trouble with a loan shark and must skip town in a hurry. But gambling problems may be the least of their worries after they get stranded in the Nevada desert. One of the guys discovers a mysterious metal fragment, then promptly goes missing during the night. When the remaining three catch up with their lost friend, there's something different about him. As his condition worsens, the others realize that something unearthly might be stalking them in the desert.