William Powell
Lt. William 'Bill' Gordon / Anson Meridan
Cesar Romero
Capt. Nicholas 'Nikki' Nieterstein
Samuel S. Hinds
John Carter, Assistant Secretary of War
Henry Stephenson
Russian Ambassador Gregory
Margaret Dumont
Mrs. Hendricks (uncredited)
Mary Forbes
Lady Cavendish (uncredited)
Tom Dugan
Agent Patrick O'Reilly (uncredited)
Bernadene Hayes
Bobbie Burns (uncredited)
Hedwiga Reicher
De Segroff's Associate (uncredited)
Milburn Stone
Carter's Aide (uncredited)