Boris Karloff

Dr. Janos Rukh

Bela Lugosi

Dr. Felix Benet

Frank Lawton

Ronald Drake

Frances Drake

Diana Rukh

Violet Kemble Cooper

Mother Rukh

Beulah Bondi

Lady Arabella Stevens

Walter Kingsford

Sir Francis Stevens

Paul Weigel

Monsieur Noyer

Frank Reicher

Professor Meiklejohn

Georges Renavent

Chief of the Surete

May Beatty

Mme. LeGrand (uncredited)

Paul McAllister

Papa LaCosta (uncredited)

Nydia Westman

Briggs (uncredited)

Ynez Seabury

Celeste (uncredited)

Robert Graves

Gendarme (uncredited)

Lambert Hillyer

Director

John Colton

Guión, Guión Adaptado

Howard Higgin

Guión, Original Story

Douglas Hodges

Guión, Historia

George Robinson

Director de Fotografía

Franz Waxman

Compositor de la Música Original

Gilbert Kurland

Sound Supervisor

Edmund Grainger

Productor

Universal Pictures

Compañía de Produccion

Fred S. Meyer

Productor Ejecutivo

Camille Collins

Production Secretary

Jack Pierce

Maquilladora

Otto Lederer

Maquilladora

Bernard W. Burton

Editor

Albert S. D'Agostino

Dirección Artística

John P. Fulton

Visual Effects

Raymond Lindsay

Special Effects

Charles Carroll

Sound Recordist