Dr. Janos Rukh

Boris Karloff

Acting

Dr. Felix Benet

Lugosi Béla

Acting

Ronald Drake

Frank Lawton

Acting

Diana Rukh

Frances Drake

Acting

Mother Rukh

Violet Kemble Cooper

Acting

Lady Arabella Stevens

Beulah Bondi

Acting

Sir Francis Stevens

Walter Kingsford

Acting

Monsieur Noyer

Paul Weigel

Acting

Professor Meiklejohn

Frank Reicher

Acting

Chief of the Surete

Georges Renavent

Acting

Mme. LeGrand (uncredited)

May Beatty

Acting

Papa LaCosta (uncredited)

Paul McAllister

Acting

Briggs (uncredited)

Nydia Westman

Acting

Celeste (uncredited)

Ynez Seabury

Acting

Gendarme (uncredited)

Robert Graves

Acting