Without Warning is a 1980 American science fiction horror film directed and produced by Greydon Clark and starring Jack Palance, Martin Landau, Tarah Nutter, Christopher S. Nelson, Kevin Peter Hall, Neville Brand, and Ralph Meeker in his final film role. It centers on an alien lifeform that arrives on Earth in order to stalk and kill humans as game. It was released by Filmways Pictures on September 19, 1980.