ट्रिविया

This science fiction movie was suggested by the 1953 non-fiction book "Flying Saucers from Outer Space" by retired U.S. Marine Corps Maj. Donald E. Keyhoe, who believed that certain aerial phenomena were interplanetary in origin.

The supposed satellite launches are stock footage of Viking rockets, high-altitude probes that were the predecessors of the Vanguard, intended to be the first satellite launcher. The later shots of rockets crashing at takeoff are really German V-2s, since none of the first 12 Vikings ever failed. Ironically, the 13th Viking, now called Vanguard, blew up on the launch pad, just as in the movie.

The scene of a destroyer blowing up is stock footage of the sinking of HMS Barham, which occurred on 25 November 1941. To not upset the British public, the Royal Navy decided to withhold an announcement until later; however, in late November 1941 a Scottish medium, Helen Duncan, who had heard of the sinking through a friend, disclosed the sinking during a seance. She was eventually tried under the British Witchcraft Act, the last person before it was repealed.

One of the scenes of a saucer attacking jets is footage of an air show crash.

Parts of the Hyperion Treatment Plant (later renamed the Hyperion Water Reclamation Plant) adjacent to Dockweiler State Beach in Los Angeles were used as the movie's headquarters. It was the sound of the sewage disposal plant's disintegration tanks that was used as the sound of the alien craft.