Diamonds are being smuggled across the border from Mexico in a specially made shoe of a palomino mare. One of the smugglers is killed when the mare runs off. The sheriff blames Trigger for the death. To keep his horse from being destroyed, Roy confesses and goes to jail. The smugglers buy Trigger and put him to work smuggling diamonds. The mare, who had earlier heard a trist with Trigger, foals Trigger, Jr. who Roy, finally out of jail, uses to help capture the smugglers.
Roy Rogers
as Roy Rogers
Trigger
as Trigger - Roy's Horse
Dale Evans
as Stormy Billings
Estelita Rodriguez
as Pepé Valdez
Pat Brady
as Sparrow Biffle
Douglas Evans
as Jeff Middleton, Owner of Oro City Hotel
Frank Fenton
as Oro City Sheriff
Greg McClure
as Henchman Ben
Dale Van Sickel
as Henchman Ed Hart
Clarence Straight
as Bartender Spud
Jack Sparks
as Guard
Chester Conklin
as Old Man
