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.

Harry Carey
as 'Happy' Cardigan

Edwina Booth
as Caroline Hall

William Desmond
as Milesburg Sheriff

Frankie Darro
as Jimmie Williams

Philo McCullough
as Stevens

Yakima Canutt
as Yak

Joe Bonomo
as Stuffy

Tom Dugan
as Oil Co. Director Warren

Lafe McKee
as T.J. Hornbeck

Bob Kortman
as Marno