Blake of Scotland Yard

Ralph Byrd

as Jerry Sheehan

Joan Barclay

as Hope Mason

Lloyd Hughes

as Doctor Marshall

Dickie Jones

as Bobby Mason

Lucille Lund

as Duchess

Nick Stuart

as Julot

Sam Flint

as Chief Insp. Henderson

Gail Newbury

as Mimi - Policewoman

Jimmy Aubrey

as The Hag / Baron Polinka

Theodore Lorch

as Daggett - the Butler (as Ted Lorch)

George DeNormand

as Pedro - Henchman

Bob Terry

as Peyton - Henchman

William Farrel

as Count Basil Segaloff

Frank Wayne

as Charles - the Footman

Dick Curtis

as Nicky