Without Warning (1980)

Sandy and Greg are teenagers who go camping, despite warnings not to, with their friends. They soon encounter aliens, who are using the area as a hunting ground.

Director: Greydon Clark

Cast: Jack Palance, Martin Landau, Tarah Nutter, Christopher S. Nelson, Cameron Mitchell, Neville Brand, Sue Ane Langdon, Ralph Meeker, Larry Storch, Lynn Theel, David Caruso, Mark Ness, Bert Davis, Jeffrey Sudzin, Darby Hinton, Kevin Peter Hall