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