One man wants to control all the land in the state to graze all his cattle. His band of outlaws are raiding ranchers and homesteaders, trying to drive them out. Rocky and Fuzzy are brought in to help stop the raiders and keep the land for the small ranchers and homesteaders.
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.
Steve Kinney and his henchman, Mort, are trying to stir up trouble between the local ranchers and farmers, behind a wave of rustling and lawlessness. Mort kills Vic, a Kirby cowhand, and lays the blame on Dan Harper, the leader of the farmers faction. Storekeeper Fuzzy Q. Jones, fearful of losing the outstanding charge-accounts he has on his books, drags his reluctant pal, Billy Carson, into the fray, and the two soon prove Kinney and his henchmen to be behind the valley's troubles.
Elliott is hunted by Curtis who has spent six years behind bars because of his testimony. After knocking out several baddies and putting up with the zany antics of his sidekick Taylor, Elliott guns down his antagonist, but Luana Walters, the girl he almost marries, will not abide a gunslinger so Elliott is compelled to ride off alone into the sunset once more.
Banker Mason is after the ranchers land so he can resell it to the railroad for a profit. He has the railroad agent killed and replaces him with his stooge who then offers even less than Mason. But Rocky eventually suspects Mason and when Bill Anderson informs him the agent is a fake, they head out after Mason
The notorious outlaw Black Bart has reappeared and the Range Busters are sent to investigate. When they find that Black Bart is now a respectable citizen and that someone is impersonating him, they set a trap for the robber.
Harris and Rigby own a circus. Rigby is a counterfeiter and frames his partner. The Mesquiteers learn Rigby is the culprit and get a confession from one of his men only to lose the case when the man is murdered in jail. The Mesquiteers try again and send Lullaby to try and win some of the fake bills in a card game.
Red Ryder gets a telegram from his old friend Dan O'Connor asking for help in his fight against Faro Savage and his gang of rustlers. A gun dropped by Faro during a rustling raid makes Red and Sheila O'Connor, Dan's daughter, think they have ample proof against Faro but they are stymied by the law. Buckskin Blodgett and the Duchess, Red's aunt, find the body of O'Connor who was killed when Faro's men sent the sheriff out on a ruse. Sheila, discovered while rifling Faros office for evidence, escapes but not before she is recognized. Faro kills one of his own henchmen and then frames Sheila for the murder. Red and Little Beaver set out to clear Sheila and to try to find evidence against Faro and his gang. Written by Les Adams
Gene returns from the East with new ranch owner Tom Bennett to find everyone's cattle dying. Blaine has reopened the copper mine and the waste is poisoning the water supply. While Gene is away Tom confronts the miners and a man is killed in the ensuing gunfight. Now Gene not only has the dying cattle problem but his ranch owner is in jail.