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
Dale Evans
Gordon Jones
Pat Brady
Grant Withers
Peter Miles
George Cleveland
Frank Fenton
I. Stanford Jolley
Stanley Andrews
Foy Willing
Emile Avery
Morgan Brown
Roy Bucko
Frank Dae
John Daheim
Herman Hack
Sam Harris
Jack Ingram
Paul Kruger
David Sharpe
Lee Shumway
Tom Steele
Brick Sullivan
Tex Terry
Jack Tornek
Dale Van Sickel