is a Spanish-American 3D Western film, featuring Tony Anthony, Victoria Abril and Gene Quintano and directed by Ferdinando Baldi.

Quintano and Lupo were Xerox salesmen who formed their own office supply firm who were interested in getting into filmmaking.

They were partners in a publishing firm with Tony Anthony, a filmmaker who had made a number of spaghetti westerns.

[citation needed] The resulting frames, though diminished in size, yielded a nominal aspect ratio of 2.39:1.

The lens system used was Optimax III (Bill Bukowski of Optimax III served as 3D Technical Advisor), notorious for introducing vertical parallax error owing to its flawed design (i.e., the optical axes of its twin lenses are not at the same horizontal level).

These converters were meant to converge the stacked left and right pictures on the screen, at the same time cross-polarizing them to match the filters in the 3-D glasses worn by the audience.

The real star is supposed to be the 3-D."[11] The movie was acquired for US release at the American Film Market in early 1981 by Filmways.

Filmways had just bought out American International Pictures and were in a state of flux at the time, having unloaded four major films, The Fan, Blade Runner, Halloween II and Ragtime.

Although the film sold well internationally, getting the producers their money back, no other offers came through and so Meyers honored his promise.

By August the studio decided to expand the film to as many cinemas that could take 3-D.[15] "They can't make the glasses fast enough", said Anthony.

Arthur Silverstein, sales manager of the Hudson Printing Company in Manhattan, said he had to put his employees on overtime to turn out the disposable polarized glasses.

[17] The film kicked off a spate of movies in 3D including Jaws 3-D, Amityville 3-D, Spacehunter: Adventures in the Forbidden Zone, Starchaser: The Legend of Orin, Abra Cadabra, Parasite, and Friday the 13th Part III.

"[8] However Quintano wanted to make a Topkapi type film about people stealing an item on an island.

[citation needed] The premiere screening of this newly restored version was held at the Berlin Film Festival on February 12, 2011.

[21] In January 2016, for the movie's 35th anniversary, a remastered version supervised by the film’s producer and star Tony Anthony was released for home video in the Blu-ray 3D format, which includes new 5.1 surround sound.