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
Trigger
Dale Evans
Estelita Rodriguez
Pat Brady
Douglas Evans
Frank Fenton
Greg McClure
Dale Van Sickel
Clarence Straight
Jack Sparks
Chester Conklin
Foy Willing