• USA
    10 June 1972
    (San Antonio, Texas)
  • USA
    21 June 1972
  • Italy
    July 1972
    (Trieste International Science Fiction Film Festival)
  • UK
    5 September 1974
    (London)
  • France
    26 March 1975
  • Mexico
    21 April 1983
  • USA
    1984
    (re-release)
  • UK
    1990
    (video premiere)