The Mysterious Mr. Valentine

William Henry

as Steve Morgan

Linda Stirling

as Janet Spencer

Virginia Christine

as Lola Carson

Thomas E. Jackson

as Police Lt. Milo Jones

Barbara Woodell

as Rita Armstrong

Kenne Duncan

as Sam Priestly

Virginia Brissac

as Martha, the Housekeeper

Lyle Latell

as Peter Musso, Henchman

Ernie Adams

as Frank Gary, Henchman

Tristram Coffin

as John Armstrong

Arthur Space

as County Coroner

Robert Bice

as Doctor

Roy Barcroft

as Blackmailer (voice) (uncredited)

Symona Boniface

as Landlady (uncredited)

Ed Cassidy

as Police Sergeant (uncredited)

James Linn

as Reporter (uncredited)

Charles Sullivan

as George - the Mechanic (uncredited)