Filmed near the site of contemporaneous nuclear testing grounds, the set was contaminated by nuclear fallout. After location shooting, much dirt from the location was transported back to Hollywood in order to match interior shooting done there. Scores of cast and crew members developed forms of cancer over the next two decades, many more than the normal percentage of a random group of this size. Quite a few died from cancer or cancer-related problems, including John Wayne, Susan Hayward, Pedro Armendáriz (who shot himself to death soon after learning he had terminal cancer), Agnes Moorehead, 'Thomas Gomez', John Hoyt and director Dick Powell. People magazine researched the subsequent health of the cast and crew, which it published in November 1980. By the time of the article's publication, 91 of the 220 members of the film's cast and crew had contracted cancer, and half of these had died from the disease. The figures did not include several hundred local American Indians who served as extras on the set. Nor did it include relatives who had visited cast and crew members on the set, such as the Duke's son Michael Wayne. The People article quoted the reaction of a scientist from the Pentagon's Defense Nuclear Agency to the news: "Please, God, don't let us have killed John Wayne".
Filmed between mid-May and August 5, 1954, the movie premiered on February 22, 1956 in Los Angeles, then opened in Manhattan at the Criterion Theatre on March 30, 1956.
Photographs exist of John Wayne holding a Geiger counter.
Wayne took his role very seriously, went on a crash diet, and took Dexedrine tablets 4 times a day.
Eccentric billionaire Howard Hughes provided the financial backing for this film and later paid an extra $12 million (estimated) for every existing print of it from a sense of guilt - it was he who paid for the shipping of 60 tons of radioactive dirt to Hollywood for retakes (see above). He kept a jealous hold on the film, not even allowing it to be seen on television, for 17 years until 1974, when Paramount managed to secure the rights to reissue it.
Sometimes referred to as "An RKO Radioactive Picture".
The screenplay was written before John Wayne became involved in the project. The writer had Marlon Brando in mind for the role.
According to Harry and Michael Medved's 1984 book "The Hollywood Hall of Shame", John Wayne's casting in this film came about during a conversation with director Dick Powell. Wayne was about the make the last film of a three-picture deal for RKO Radio and Powell had been assigned to direct. They were going over various scripts in Powell's office when the latter was called away for a few minutes. When Powell returned, he found Wayne enthusiastically looking over a script that Powell had intended throwing in the waste basket. It was the screenplay for "The Conqueror". Powell tried to talk him out of it, but Wayne insisted that this was the film he wanted to make. As Powell later summed it up, "Who am I to turn down John Wayne?"
Average Shot Length = ~8.2 seconds. Median Shot Length = ~7.5 seconds.
This became the final motion picture project for billionaire Howard Hughes, ending his thirty year involvement with the industry. Jet Pilot (1957), a film he produced in 1949, would finally be released the following year.
This film is listed among The 100 Most Enjoyably Bad Movies Ever Made in Golden Raspberry Award founder John Wilson's book THE OFFICIAL RAZZIEŽ MOVIE GUIDE.
One of the films included in "The Fifty Worst Films of All Time (and how they got that way)" by Harry Medved and Randy Lowell.
John Wayne regretted playing Temujin in The Conqueror (1956) so much that he visibly shuddered whenever anyone mentioned the film's name. He once remarked that the moral of the film was "not to make an ass of yourself trying to play parts you're not suited for."