Elenco

• 

  Boris Karloff

  Dr. Janos Rukh

• 

  Lugosi Béla

  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