Skinner and his gang are grabbing land from the ranchers. When they go after Kerry's ranch Ken stops them. Skinner frames Ken for rustling but the Sheriff is on Ken's side, and with the help of his brother Earl's Boy Scout troup they go after the gang.
Montana and sidekick Pancho hire on at the Lopez rancho to fight Daggett and his outlaw gang. But Lopez's foreman Barnes is one of Daggett's men and he frames Montana for murder.
Kincade and Blake cause a mail plane carrying a payroll to make a forced landing in the desert. When they try to get the money, prospectors Ted and Si drive them away. With the pilot shot, Ted takes over as pilot figuring another attempt will be made and this time the Sheriff will be there.
A con man posing as a lawyer tries to sell copies of a phony law book. Things get serious when he has to defend a young man falsely accused of robbery.
Cowboy is hired by an archaeologist to help find "Hidden Valley", where an Indian gold treasure is supposed to be buried. Just when he finds it, the archaeologist is killed, and the cowboy his charged with his murder.
Ken Maynard's exceptionally intelligent horse, Tarzan the Wonder Horse, is the star of this western about evil cowboy Steve Frazer (Welch) who gathers horses for slaughter, whose meat is sold to pet food manufacturers. The wild horse Tarzan frees the doomed horses from their corrals, and Frazer convinces the Sheriff that Tarzan is a threat and can be shot on sight. Local cowboy Ken Benson (Maynard) and rancher Pat Riley (Kennedy) work together to clear Tarzan's good name and put Frazier behind bars for his evil deeds.
Officer John Brown is after the outlaw known as the Night Rider. Posing as Jim Blake he takes a job on the Rogers ranch. He finds the secret passage from the Rogers mine to the Rogers house used by the Night Rider and also a note written by the Night Rider to his henchmen. Practicing his hand writing, he has a plan to trap him.
Howell breaks up a train robbery only to find that it's a fake. However the money is missing and he is blamed. He escapes and sets out to find the real thieves. He must also avoid being caught visiting the Collins ranch to see Doris.
Tex Mason and Peggy Turner each inherit one half of the Triple X Ranch. Thomas wants the ranch and he has Triple X hand Joe let his men rustle their cattle. Tex not only has to fight the rustlers, he must also contend with Easterner Peggy's idea of what a ranch should be.
Canadian Mountie Mason is sent south of the border to look for a horse thief with only a watch chain for evidence. He befriends young Andy and when Calhoun hits Andy, Mason and Calhoun fight. In the scuffle Calhoun's watch with the missing chain is dislodged. Mason then sets out to bring in Calhoun and his gang.
The Rangers in New Mexico are being disbanded but Bob Houston gets them to make one more ride. They go after the outlaw gang led by Hashknife. They catch Hashknife, but he escapes taking Barbara with him and Bob and Slim have to go after him again.
Heading west, Ken and Bouncer end up at the Brooks ranch where Ken is to ride Tarzan in the big race. But both the Sheriff and Edmonds are after him and he must hide both himself and the horse until race time.
A man known as The Drifter returns home to his cabin in the woods and winds up getting involved with an escaped convict, a gunfighter, lumber company rivals, mysterious family ties and murder.
Pete Marlan is a gambler with an unsavory past. Suspected of being an outlaw, Pete plays along with this misconception, the better to infiltrate a gang of smugglers. Along the way, he clears the name of the brother of Texas Ranger Mike Donovan, and helps patch up the romance between Donovan and heroine Bernice.
Burgess and Greeley are rustling horses and shooting Indians. When they kill Manual they frame Lieutenant Allister. His older brother John now attempts to defend him at his murder trial.
When Rod, Ramrod, and Half-A-Rod ride into Steep Gulch, they immediately become Sheriffs. The previous Sheriffs have been killed by Mace and his gang who don't wait long before they make an attempt on the new trio.