William Powell as David Talbot aka Jean Pelletier

Hedy Lamarr as Lucienne Talbot

Claire Trevor as Michelle Allaine

Basil Rathbone as Henri Sarrou

Margaret Wycherly as Madame Pelletier

Felix Bressart as Dr. Andre Tessier

Sig Ruman as Dr. Alex Dubroc

H.B. Warner as Prosecuting Attorney

Philip Merivale as Commissaire

Enrique Acosta as Associate Judge (uncredited)

Francis X. Bushman Jr. as Giant Policeman (uncredited)

Frank Conroy as Defense Attorney (uncredited)

Gibson Gowland as Reporter (uncredited)

Fritz Leiber as Foreign Minister Deval (uncredited)

Eric Mayne as Courtroom Spectator (uncredited)

Anna Q. Nilsson as Madame Deval (uncredited)

John St. Polis as Professor (uncredited)

Vladimir Sokoloff as Carlos Le Duc (uncredited)

Torben Meyer as Old Man (uncredited)