Rin-Tin-Tin Jr.
— Rin-Tin-Tin
Regis Toomey
— Bob Franklin, alias Rocky Morgan
Jack Mulhall
— Border Patrolman Ed
Molly O'Day
— Ann Norton
Jack Mower
— King
Lois January
— Barbara Franklin
James Murray
— Matt
John Elliott
— John Norton
Tom London
— Henchman Jennings
Milburn Morante
— Dad Miller
George Chesebro
— Henchman "Dude"
Bob Walker
— Henchman Saunders
Jack Evans
— Henchman Carter
George Hazel
— Henchman Slim