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.
Rosario, the niece of the rancher, returns to the ranch after ten years of absence. She takes in Margarito, a worker at the ranch, who is immediately smitten by her. Rosario is rescued from a runaway horse by the Seven Men, an outlaw a la Robin Hood that steals from the rich and gives to the poor. He also happens to be the twin brother of Margarito, unbeknownst to him. The confusion between Margarito and the Seven Men generates great comical situations in the film.
It's World War 2 and saboteurs are out to destroy the ranchers food crop. Steve Travis and sidekick Cannonball have been called in to investigate. Avoiding the attempts on his life by the gang, Steve uses a pair of eyeglasses to discover their leader, a supposedly deaf mute shoe repairman.
Rangers Tex Wyatt and Jim Steele arrive in Gabe's Crossing, NM, to capture Bent Yeager, a rancher accused of sabotaging the progress of the railroad.
Johnny Mack Brown is sent to the badlands to round up an elusive outlaw gang.
Just as Nevada wins $7000 in yellowback bills, Ben Ide takes his $7000 and heads out to buy mining equipment. Burridge has his man Powell kill Ide and retrieve the money and Nevada finds Ide just as the posse arrives. Found with the money Nevada is arrested and Burridge now gets Powell to incite the local citizens to lynch Nevada.
The Three Mesquiteers, as army scouts, soothe hostilities between the Army and Indians after both have been riled by someone with a hidden agenda - a renegade chief, who is found to be masquerading as an Army interpreter.
The Mesquiteers try to help their friend build a telegraph system, despite a local newspaper editor's attempts to sabotage the lines.
A noted gunman takes a job on a cattle ranch to stop a band of rustlers.
In this western, a rancher's son rides out for revenge against the rustlers who killed his father. The pursuit stretches between Montana to Arizona and it becomes more difficult because though the son knows the killer's name, he has never seen his face. Fortunately, the killer doesn't know what the son looks like either.
In this romantic western, the real stars are a mustang and a police dog. The human aspect of the story centers on a rodeo rider whose late father bequeathed him a ranch in Calgary, Canada. The rider really tries to settle down to ranching, but finds himself pining for the rodeo. His forewoman, also a former rodeo performer, thinks her employer is shirking his duties and needs to forget about broncos, and bull-riding and settle down. Meanwhile, the fellow also longs to catch the white stallion running wild. The dog helps out.
The Three Mesquiteers convince a group of settlers to exchange their present property for some which, unbeknownst to our goodguys, is going to be worthless. They are captured before they can warn the ranchers.
Dare Rudd takes a shine to his cattleman cousin Tom's girlfriend who asks Tom to hire Dare to head the big cattle drive. Dare loses the money for the drive to cardsharps, but Tom wins it back, but Dare must save Tom's life.
Disguising himself as a milquetoast Easterner who writes Western novels, Hoppy enrolls in a dude ranch in order to unmask the murderer of the owner's husband.
Lorna Drake has inherited a ranch. Hoppy teaches her a bit about ranching and handles Scar Lewis, the bad guy, in the process.
Hopalong Cassidy, boss of the Bar 20 ranch in Texas, rides down the Camino Real in the New Mexico cattle country near Alamogordo, in response to an urgent message from his lifelong sweetheart, Nora Blake, who is in serious trouble. Before he and his saddlemates, "Lucky" Jenkins and "Pappy", can reach her ranch, they are stopped by Clay Allison, a cattle-rustler who is in almost complete control of the district, and wants to extend his holdings by seizing Nora's cattle and driving her out. Seeing Cassidy as a menace to his plans, he has him arrested on a trumped-up charge. Cassidy and his pals shoot their way out of the trouble and reach Nora;s ranch where they learn that Allison's henchmen have murdered her foreman, Tom Dillon, and Allison has sent for a crew of outlaws on the Texas border.
A cattle-vs.-sheepman feud loses Connie Dickason her fiance, but gains her his ranch, which she determines to run alone in opposition to Frank Ivey, "boss" of the valley, whom her father Ben wanted her to marry. She hires recovering alcoholic Dave Nash as foreman and a crew of Ivey's enemies. Ivey fights back with violence and destruction, but Dave is determined to counter him legally... a feeling not shared by his associates. Connie's boast that, as a woman, she doesn't need guns proves justified, but plenty of gunplay results.
Ken McLaughlin is a precocious 10-year-old who lives with his family on a remote Wyoming ranch. When Ken returns home from school with failing grades, his father, Rob, blames the boy's lack of personal responsibility. At the suggestion of his wife, Nell, Rob allows Ken to choose a single colt from the herd to raise as his own. Much to his father's dismay, Ken chooses a fiery mustang filly -- but the two soon become fast friends.
When Professor Marsh disappears while searching for the lost city of Lukachukai, his daughter enlists the help of the Three Mesquiteers.
Sheriff John Higgins quits and goes into prospecting after he thinks he has killed his best friend in shooting it out with robbers. He encounters his dead buddy's sister and helps her run her ranch. Then she finds out about his past.