Alternate versions

The film had an intermission in its original 3-D release, although it is less than two hours in length.

Converted to 3-D for United Kingdom release on July 26, 2013.

Filmed and originally briefly released in 3-D. Later shown in conventional flat" version. It was reissued in 3-D in 1980.

Released in Japan in the short-lived VHS format in 3-D. This disc has been widely copied to make VHS bootleg tapes, DVDs, and blue-ray discs.