The Mysterious Mr. Valentine

William Henry

Steve Morgan

Linda Stirling

Janet Spencer

Virginia Christine

Lola Carson

Thomas E. Jackson

Police Lt. Milo Jones

Barbara Woodell

Rita Armstrong

Kenne Duncan

Sam Priestly

Virginia Brissac

Martha, the Housekeeper

Lyle Latell

Peter Musso, Henchman

Ernie Adams

Frank Gary, Henchman

Tris Coffin

John Armstrong

Arthur Space

County Coroner

Robert Bice

Doctor

Roy Barcroft

Blackmailer (voice) (uncredited)

Symona Boniface

Landlady (uncredited)

Ed Cassidy

Police Sergeant (uncredited)

James Linn

Reporter (uncredited)

Charles Sullivan

George - the Mechanic (uncredited)