Miller, Soule, and Tremayne provide the voices for the narrated portions of the film. Although the movie contains only two brief film clips to serve as photographic evidence of UFO's, the producers build a good case based on the credibility of certain UFO witnesses (airline pilots, military personnel, radar operators, etc.).
On a more subtle level, director Winston Jones pulls off a clever trick; he begins the film as a pure documentary, but he gradually modifies this approach and focuses on reporter Al Chop's personal involvement in the UFO investigation. Chop slowly changes from UFO skeptic to UFO believer
The climax is a gripping reenactment of a true incident which occurred in 1950, when a group of UFO's cruised above Washington DC for several hours. The voice of Harry Morgan is heard over the radio as an Air Force pilot whose plane is literally surrounded by UFO's, during which Al Chop and a group of bewildered military men cluster around the radar scope, watching in wide-eyed wonder.
Dramatically speaking, this scene is far superior to its counterpart in `Close Encounters of the Third Kind'. The most amazing thing about this film is the fact that it was made with the full cooperation of the United States government, and every scrap of evidence it presents was made available to any and all scientific agency who wanted to examine it.