In this remake of No Man's Range (1935), Shamrock travels to the ranch of his stepfather who he has never met and finds himself caught in the middle of a range war.
Released from a navy hospital following WW II, Lon Evans learns that he faces eventual blindness and returns to his Wyoming ranch. He sees a beautiful white stallion named Starlight and his cowhands Lem and Yancy say he is a killer and cannot be trained. Lon disproves this by training the stallion to act as his guide in preparation for his future blindness.
Bringing Bart Calhoun (Marshall Reed) to justice for his complicity in a robbery/murder, Johnny assumes that his job is over. Not by a long shot! Calhoun's arrest leads to the uncovering of a wide-ranging conspiracy to smuggle silver from Mexico to the United States.
Tom is a cowboy boot-wearing cat at a Texas dude ranch. When a beautiful female cat comes for a visit, Tom takes time from his regular torturing of Jerry to use the mouse as a way to impress the dame. Naturally, Jerry gives Tom his comeuppance.
Frontier scout Daniel Boone is sent out to locate the only two survivors of General Braddock's men that are believed two have lived through an Indian massacre.
The U.S. government recognizes land grants made when the West was under Spanish rule. This inspires James Reavis to forge a chain of historical evidence that makes a foundling girl the Baroness of Arizona. Reavis marries the girl and presses his claim to the entire Arizona territory.
Late in the Civil War, three Confederate soldiers escape from a Union prison camp in Missouri. They soon fall into the hands of pro-Confederate raiders, who force them to act as "outriders" (escorts) for a civilian wagon train that will be secretly transporting Union gold from Santa Fe, New Mexico, to St. Louis, Missouri. The three men are to lead the wagons into a raider trap in Missouri, but one of them starts to have misgivings....
Billy the Kid becomes embroiled in Lincoln County, NM, land wars. When rancher who gave him a break is killed by rival henchman, Billy vows revenge. New employer takes advantage of his naivety to kill rivals, lets the Kid take rap. Kid takes to the hills with friends until caught. Escapes hanging but remains in area to be near employer's young wife with whom he's infatuated
Notorious stagecoach robber Rhiannon is unintentionally appointed as deputy when he saves the sheriff's life and must wear two hats between his new job that he enjoys and his old occupation that he misses.
The Dalton gang has moved west taking new identities and Marshals Lash and Fuzzy are after them. They receive help from Pinkerton agent Joan Talbot as they try to sort out who the bad guys really are.
A prospector discovers natural cement and suggests it should be used for a new dam. But this is the last thing the badmen of Trail End want, as they have a monopoly of the wagons needed to haul rocks to the site. A pretty sheriff notwithstanding, it's a job for a singing marshal.
The owner of a silver mine, having repeatedly been the victim of the Silver Bandit, sends his clerk Spade Cooley who can neither ride nor fight west to investigate. The Sheriff has been unable to catch the bandit but when Spade finds him he will have to both ride and fight to bring him in.
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.