Richard Travis
— Tom Norman / Rattick
Helen Westcott
— Mary Lynn
Emory Parnell
— Capt. Jan Roburt
Richard Fraser
— Operative Farrell
James Griffith
— Operative Dale
Ralf Harolde
— Steele
Selmer Jackson
— Capt. Wright
Gene Roth
— Ehrlich
William Tannen
— Dajek
Otto Reichow
— Balser
Pierre Watkin
— Mr. Sigmund
Paul Bryar
— Cmdr. Braddock
William Haade
— Anorus
Jason Robards Sr.
— Dr. Loring