With Tim Holt still in military service and Robert Mitchum promoted to "A" pictures, RKO Radio attempted to create a new B-western star in the form of James Warren, who starred in three sagebrushers over a three-year period. Warren's second RKO effort was Sunset Pass, a remake of an oft-filmed Zane Grey story. The star is cast as Rocky, a railway express officer assigned to break up a train-robbery gang operating on the Arizona border. John Laurenz plays Rocky's Spanish-Irish sidekick Chito Rafferty, a role later assigned to Richard Martin in the Tim Holt series. One of the film's two heroines is played by Jane Greer, who unlike James Warren was destined for bigger things at RKO.