The plot for the Arnold Schwarzenegger sci-fi/action film Predator (1987) also features the same idea of an alien from outer space that hunts humans. The same actor who plays the alien in "Without Warning", Kevin Peter Hall, also plays the Predator.
The alien head was created by special makeup effects artist Rick Baker. According to producer / writer Daniel Grodnik, "It cost me $19,000 to have Rick Baker - in his kitchen - make that alien head. And that was what was used on all the posters and everything else. So, it was worth it."
The studio company that owned the rights to the movie, Filmway Pictures, later sold it to the now bankrupt Orion Pictures. Long unavailable in America on VHS, Laserdisk, DVD, or Blu-Ray, this film was finally given an official Region 1 release in both the DVD and Blu-ray formats by Shout! Factory in August, 2014.