Without Warning USED

A group of teenagers head out to the lake for a relaxing camping trip in the mountains. They ignore the warnings of the local truck stop owner and head to their destination. Things go terribly wrong when they run into an extraterrestrial who throws deadly discs that suck the blood of their victims. The group heads back to the truck stop for help from the eclectic group of residents: a crazy war veteran (Martin Landau, Ed Wood) and a determined hunter (Jack Palance, Batman).