Felix Bressart
Dr. Andre Tessier
Sig Ruman
Dr. Alex Dubroc
Anna Q. Nilsson
Madame Deval (uncredited)
Basil Rathbone
Henri Sarrou
Gibson Gowland
Reporter (uncredited)
Torben Meyer
Old Man (uncredited)
John St. Polis
Professor (uncredited)
Vladimir Sokoloff
Carlos Le Duc (uncredited)
Frank Conroy
Defense Attorney (uncredited)
Claire Trevor
Michelle Allaine
William Powell
David Talbot aka Jean Pelletier
H.B. Warner
Prosecuting Attorney
Margaret Wycherly
Madame Pelletier
Hedy Lamarr
Lucienne Talbot
Fritz Leiber
Foreign Minister Deval (uncredited)
Philip Merivale
Commissaire
Eric Mayne
Courtroom Spectator (uncredited)
Enrique Acosta
Associate Judge (uncredited)
Francis X. Bushman Jr.
Giant Policeman (uncredited)