Hour of the Gun (1967), a western movie about Wyatt Earp (James Garner) and Doc Holliday (Jason Robards), attempts more historical accuracy than most accounts of the events, and explores what happened after the gunfight at the O.K. Corral. Robert Ryan portrays Earp's nemesis Ike Clanton.

Directed by John Sturges, the movie is a sequel to his own more fictionalized film from ten years earlier, Gunfight at the O.K. Corral, which had featured Burt Lancaster as Earp and Kirk Douglas as Holliday. Oddly, Garner also played the lead as Wyatt Earp in a different movie filmed twenty-one years later, Blake Edwards's Sunset (1988), a comedy thriller based on the 1920s period during which Earp was a technical adviser for silent films. The film's music is composed by Jerry Goldsmith.

Prior to production, United Artists had made it quite clear to director John Sturges that none of the primary roles were to be filled by the actors who played the same characters in Sturges' previous Wyatt Earp film, Gunfight at the O.K. Corral (1957). Wanting to distinguish this film from the previous one, they demanded different actors be cast in the roles. However, Sturges believed that the roles of Virgil and Morgan Earp from the previous film were small enough that the same actors who played them could do it again without harming the film's uniqueness. The studio agreed and allowed Sturges to cast John Hudson (I) (Virgil Earp) and DeForest Kelley (Morgan Earp). Unfortunately, Hudson had retired from acting in the early '60s and was unwilling to do the role. Kelley, on the other hand, was currently working on the TV series "Star Trek" (1966) and was unable to break away to play Morgan Earp. Thus, both Earp brothers were recast.