Jerry Mason, a young Texan, and Jake Benson, an old rancher, become partners and strike it rich with a gold mine. They then find their lives complicated by bad guys and a woman.
Upon the death of his father, who was the tribal chieftain, Joe Thunder Horse returns to the reservation of his youth, only to discover that his people are dying of various diseases and are being systematically cheated of their possessions and basic rights by crooked Indian agents. He heads to Washington in hopes of righting these wrongs, only to experience prejudice and hatred all along the way.
Thinly veiled reworking of the Wyatt Earp story with the renamed Michael Wyatt rolling into Tombstone, becoming acquainted, teaming up, and cleaning up the town with the help of “Doc” Warren and saloon singer Queenie La Verne, while sweet young maiden Mary Reid waits patiently on the sidelines.
Imprisoned for a murder he did not commit, John Brant escapes and ends up out west where, after giving the local lawmen the slip, he joins up with an outlaw gang. Brant finds out that 'Jones', one of the outlaws he has become friends with, committed the murder that Brant was sent up for, but has no knowledge that anyone was ever put in jail for his crime. Willing to forgive and forget, Brant doesn't realize that 'Jones' has not only fallen for the same pretty shopgirl Brant has, but begins to suspect that Brant is not truly an outlaw.
Wanting the Lance ranch, Burkett kills Lance and brings in an imposter to pose as the heir Ken Lance. Ken learns of the plan, captures the imposter, and arrives posing as himself. In an ensuing gunfight a man is killed and Ken is in trouble when not only is he accused of the murder, but the imposter escapes and convinces the Sheriff he's the real Ken Lance.
Rodeo star forms a strong bond with the noble horse he took from the wilds and trained. Unfortunately, they end up on different life paths and are separated. When at last they are reunited, the cowboy is appalled to discover that Smoky has become a broken down cart horse with an appointment at the local abattoir. Fortunately the cowboy intervenes and saves the horse from death
Seeker Dean has found the gold he has been looking for for 15 years. Heading for the Government office, Boone Jackson kills him. Kickabout finds a cryptogram as to the gold's location and Sergeant Kinkaid solves the puzzle. But Jackson learns of the gold's location and to get it, he sets out to dynamite the dam that would flood the entire communuty.
Young Scooter O’Neal, orphaned after his father’s suicide, is sent out West to live with family friend Dobe Jones. Unaware of his father’s fate Scooter longs to return to his home in Chicago especially after discovering Dobe is an embittered ranch hand hellbent on seeking revenge on his duplicitous wife Eleanor and the man she ran off with. Dobe is dogged in his pursuit until he unwittingly puts Scooter’s life in danger. Seeing the error of his ways the pair ride off together in search of a new adventure.
Hester and Hezekiah plan to get Dorothy Horton's inheritance. But when Pete and his men rob the stage they learn of the scheme and send Jim to replace Hezekiah. The Deputy Marshal breaks this up but Black Pete arrives wearing the Marshal's badge and has the Sheriff take him away while he flees with the inheritance money.
When Mort loses his and Ken's money at poker, Goss gets him to rob the stage. He is captured, identified by his palomino horse. Ken tries to clear him by robbing a stage while riding a palomino, but he also gets caught.
Men are relaxing in the bunkhouse, when in walks James Melton, who sings some old songs. After he goes through "Red River Valley", "Home on the Range", "The Big Corral", and "The Old Chisholm Trail" -- while the screen shows cowboys wrangling cattle -- he leaves, despite offers to stay the night and give him breakfast.
Columbia's King of the Wild Horses is a remake of the silent Hal Roach western feature of the same name -- and with the same "star," Rex the Wonder Horse, in the lead. Most of the story involves the romantic triangle between rogue stallion Rex, the gorgeous mare Lady, and villainous black steed Marquis.