All Cast
Rex
Rex King of the Wild Horses
Rin-Tin-Tin Jr.
Rinty
Bob Custer
John Sheldon
Lucile Browne
Alice Ingram
Ben Turpin
Henry
Edmund Cobb
Henchman Jim Luger
Richard Cramer
Frank Nolan
Lafe McKee
Charles Ingram [Chs. 1, 3, 12]
Ernie Adams
Henchman Raymond
Slim Whitaker
Henchman Mack
Richard Alexander
Lewis R. Lou Salters [Ch. 1]
Jack Rockwell
Sheriff [Chs. 1, 7-8, 11-12]
