One of many 1970s UFO documentaries, this one features lots of still photos of alleged UFOs, some UFO motion picture footage, and the usual stock footage and images acquired from government and military sources. Among the many people interviewed are UFO researchers Stanton Friedman and Ted Phillips, UFO abductees Betty Hill and Travis Walton, optical physicist Bruce Maccabee, and retired U.S. military officers Jesse Marcel and Wendelle Stevens. The documentary supports the view that alien visitors regularly come to Earth and have perhaps done so for centuries.