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Adapted by director Paul Sloan from the novel by Will James, Lone Cowboy is an "outdoors" epic tailored to the talents of young Jackie Cooper. Actually the title character is not played by Cooper but by character actor Addison Richards, cast as a grizzled old rodeo rider named Dobe Jones. Placed in charge of Eastern lad Scooter O'Neal (Cooper), Dobe forms a strong friendship with the kid, but this does not dissuade him from his main purpose in life -- to track down his runaway wife Eleanor (Lila Lee) and her lover Jim Weston (Gavin Gordon). Finally catching up to the errant couple, Dobe shoots and kills Weston, a violent outburst that also seriously wounds Scooter. Evidently a more sombre ending was planned for Lone Cowboy than the hastily tacked-on happy denouement.