UFO (TV series)
A single season of 26 episodes (including the pilot) was filmed over the course of more than a year; a five-month production break was caused by the closure of MGM-British Studios in Borehamwood, where the show was initially made. Production then moved to Pinewood Studios in Buckinghamshire. "UFO" was first broadcast in the UK and Canada in 1970, and in US syndication over the next two years.
UFO Hunters
In the US, History Channel only released the first two seasons on DVD in the correct airdate order. However, the format was only released in full screen (1:33:1) instead of wide screen. In the UK, History Channel released the third and final season on DVD however, the episodes were released in the incorrect airdate order. In a 2011 interview with podcaster Jim Harold, William J. Birnes claimed that after the Dulce Base episode aired, the show was canceled by top level executives at History Channel.