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En route to a Wild West show in Cheyenne, Wyo., cowboy star Roy Rogers (Roy Rogers) intervenes when he sees young outlaw Steve Paxton (Byron Barr) murder a veterinarian who's on his way to tell local rancher H.T. McKenzie (Roy Barcroft) that his cattle herd is infected with hoof-and-mouth disease. With the help of grocer Sparrow Biffle (Pat Brady) and schoolteacher Ruth Shaw (Dale Evans), Roy tries to bring Paxton to justice and keep McKenzie from selling the diseased cattle. Wikipedia