Frank Reicher

as Hospital Superintendent

as Darius 'Doc' Green

as The Minister

as Maasdam

as Pop, apartment concierge

as Michael Hasdon

as Harper

as Prof. Matthew Norman

as Professor Schmidt

as Lyman

as Professor Matthew Norman

as Dr. Timmons

as Magistrate

as Fritz

as Jarvis, Goodwin's Butler

as Friehof

as President

as Prof. Kendall

as Lyons the Storekeeper (uncredited)

as Police Official (uncredited)

as Second Doctor (uncredited)

as Stage Director

as Carl - gang engineer

as Dr. Peters

as Dr. Pfeiffer

as Professor Meiklejohn

as Gustave Roubet (as Frank Reigher)

as Dr. R.A. Jackson

as Dr. Jaipur

as Abe Ohlman (uncredited)

as Dr. Carl Cooper

as Mr. X

as Herr Winterstein

as Captain Englehorn

as Herr Hauptman

as Joe Valerie

as Captain Englehorn

as Dr. Stegg

as Garfinkle

as Warden in Germany (uncredited)

as Rankin

as The Cook - Spy

as Arresting Detective (uncredited)

as The Schoolmaster