Watch VoirFilms. The Johnny Mack Brown West of Wyoming concerns the efforts by cattle baron Simon (Stanley Andrews) to prevent the opening up of the rang to homesteaders. Government agent Brown comes calling when Simon begins resorting to cold-blooded murder. The leading lady is Gail Davis, a few years shy of her Annie Oakley TV stardom. Surprisingly, West of Wyoming contains none of the comedy relief that had characterized earlier Johnny Mack Brown oaters.