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Rustler's Roundup was western star Tom Mix's final feature film; only the 1935 serial Mystery Rider remained before Mix bid adios to the movies. Our Tom comes to the aid of heroine Diane Sinclair, who is being victimized by swarthy Noah Beery Jr. Sinclair's dad has been murdered, and Beery Jr., perpetrator of the deed, now wants to get his dirty mitts on her ranch. You can bet that ranch that Mix won't let that happen! Walter Brennan, three years away from stardom, has a bit role. While filming Rustlers' Roundup, Tom Mix suffered an injury which kept the 53-year-old star off-camera for nearly two years.