On screen
Cast
12 credited performers
Boris Karloff
Gen. Nikolas Pherides
Ellen Drew
Thea
Marc Cramer
Oliver Davis
Katherine Emery
Mary St. Aubyn
Helene Thimig
Madame Kyra
Alan Napier
St. Aubyn
Jason Robards Sr.
Albrecht
Ernst Deutsch
Dr. Drossos
Skelton Knaggs
Andrew Robbins (uncredited)
Artwork unavailable
Sherry Hall
Col. Kobestes (uncredited)
Artwork unavailable
Erick Hanson
Officer (uncredited)
Rose Hobart
Mary St. Aubyn (in long shot; uncredited)