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.
Roy Rogers
Trigger - The Smartest Horse in the Movies
Kay Harkrider
Splinters
Sparrow Biffle
Manson
Larry Harkrider
Colonel Harkrider
Sheriff
Doc Brown
Rancher Wilkins
Man at Auction (uncredited)
