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)

Eric Mayne

Courtroom Spectator (uncredited)

Anna Q. Nilsson

Madame Deval (uncredited)

John St. Polis

Professor (uncredited)

Vladimir Sokoloff

Carlos Le Duc (uncredited)

Torben Meyer

Old Man (uncredited)