William Powell

David Talbot aka Jean Pelletier

Hedy Lamarr

Lucienne Talbot

Claire Trevor

Michelle Allaine

Basil Rathbone

Henri Sarrou

Margaret Wycherly

Madame Pelletier

Felix Bressart

Dr. Andre Tessier

Sig Ruman

Dr. Alex Dubroc

H.B. Warner

Prosecuting Attorney

Philip Merivale

Commissaire

Enrique Acosta

Associate Judge (uncredited)

Francis X. Bushman Jr.

Giant Policeman (uncredited)

Frank Conroy

Defense Attorney (uncredited)

Gibson Gowland

Reporter (uncredited)

Fritz Leiber

Foreign Minister Deval (uncredited)