A mysterious master criminal known as The Voice plots with his gang to sabotage the Milesburg Oil Company, but the rightful heir has a secret army of her own to protect her rights.
'Happy' Cardigan
Harry Carey
Caroline Hall
Edwina Booth
Milesburg Sheriff
William Desmond
Jimmie Williams
Frankie Darro
Stevens
Philo McCullough
Yak
Yakima Canutt
Stuffy
Joe Bonomo
Oil Co. Director Warren
Tom Dugan
T.J. Hornbeck
Lafe McKee
Marno
Bob Kortman
Jed Williams
Edward Hearn
Oil Co. Director Larribee
Paul Weigel
Oil Co. Director Bishop
Frank Brownlee
Nurse Lewis
Olive Carey
Sheriff of Slocum / Deputy Thompson / Henchman Dave / Horseman
Al Taylor
Rawlins
Dick Dickinson
Pete Morrison
Pete Morrison
James "Dodger" Valenti
Dick Hatton
The Voice (voice)
Boris Karloff
Oil Co. Director Allen
Bob Walker
Rex
Rex