Armand Tesla
Bela Lugosi
Nicki Saunders
Nina Foch
Miss Northcutt (uncredited)
Jeanne Bates
Horace (uncredited)
Billy Bevan
Ben (uncredited)
Olaf Hytten
John Ainsley
Roland Varno
Andreas Obry
Matt Willis
Lady Jane Ainsley
Frieda Inescort
Sir Frederick Fleet
Miles Mander
Elsa Walter - Governess
Ottola Nesmith
Dr. Walter Saunders
Gilbert Emery
Detective Lynch
Leslie Denison
Detective Gannett
William Austin
Story
Kurt Neumann
Director
Lew Landers
Producer
Sam White
Additional Dialogue
Randall Faye
Writer
Griffin Jay
Director of Photography
L. William O'Connell
Original Music Composer
Mario Castelnuovo-Tedesco
Editor
Paul Borofsky
John Stumar