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