Evil Grant Withers lets a killer horse loose to ruin valuable horses on nearby ranches. He hopes to shake down the ranchers for his "protection". Roy tracks down the bad guys, but is suddenly trapped by them. Peter Miles, a boy terrified of horses, overcomes his fear and rides for help to save the day.

The bad guys dynamite a fish hatchery. They're trying to put the hatchery out of business so they can get possession of oil underneath the lake. Roy is a game warden investigating the dynamiting.

Doris Rogers, half owner of a dude ranch, as Jimmy Wakely, "Lasses" White and Dusty Smith to help run it. U.S. Marshal Tom Logan, posing as a stage driver, is killed during a mock holdup of new arrivals to the ranch. Brenda Amers and Horatio Pennypacker, eastern jewel thieves, bring their loot to Roy Williams, who owns the other half of the ranch as a blind for his gang which resells stolen jewels. Vaughn, the desk clerk, re-cuts the jewels in a secret room in the ice house. Fearing he will be caught, Brenda refuses Williams her stolen diamonds and hides them in a bar of soap.

Sintown is just a deserted ghost town until Vanerpool starts looking for silver. Cookie and Roy's partners put $20,000 into the business only to find that the mine is worthless and Vanerpool is bankrupt. Carol comes out to look for silver to save the company, but does not know that their engineer, named Regan, is crooked and wants all the silver for himself. But only Old Ed knows where the mother lode is located.

The "star" in the title of this low-budget singing Western was Dynamite, a wild stallion captured by cowboy Curt Walker to ride in the Big Rodeo. Unscrupulous John Burton has bet against Curt and does his best to sabotage the event. When lovely Barbara Allen, Curt's new girlfriend, leaves town because of Burton's schemes, Curt loses the first couple of events. The big Bronco Busting contest is coming up, and Pop Walker stalls the proceedings with a series of singing acts while the girl's brothers attempt to locate her. Barbara arrives just in time to spur Curt on to victory.

Roy is put in charge of a highway construction project. A rancher tries to stop Roy from putting a highway across his land because he fears that the authorities are going to discover the unscrupulous manner in which he got it.

An experimental weather satellite and a missile base are at stake when Roy discovers foreign agents around his ranch.

An Indian agent comes to the rescue when a local tribe's fishing rights are threatened by a greedy cannery owner.

Roy puts a stop to gun smuggling.

A rancher who becomes a pilot staunchly defends the newly formed Civil Air Patrol from the cattle barons who fail to see the value of airplanes on the range.