Gwili Andre as Eugenie Dorain

Gregory Ratoff as Han Moloff

Frank Morgan as François St. Cyr

John Warburton as Leon Renault

Rochelle Hudson as K-31

Christian Rub as Anton Dorain

Murray Kinnell as Bertillon

Arnold Korff as Grand Duke Maxim

Kendall Lee as Rina Harka

Lucien Prival as Lomzoi

Guido Trento as Count de Marsay

Wong Chung as Chinese Guard (uncredited)

Harry Cording as Man Reading Newspaper (uncredited)

Chester Gan as Chinese Guard (uncredited)

Julia Swayne Gordon as Madame Danton (uncredited)

Kate Drain Lawson as Cecile Rodin, aka "Madame La Prop." (uncredited)

Vivien Oakland as Cohort of Moloff (uncredited)

Ellinor Vanderveer as Cohort of Moloff (uncredited)

Michael Visaroff as Pickpocket Victim (uncredited)