Nelson Eddy
— Captain Jim Laurence
Ilona Massey
— Natalia Alanova
Joseph Schildkraut
— Count Igor Savin
Elsa Lanchester
— Princess 'Tanya' Tatiana
Hugo Haas
— Prince Nickolai Balinin
Lenore Ulric
— Baroness Kruposny
Peter Whitney
— Volkoff Overseer
Tamara Shayne
— Olga Natalia's Maid
Ernö Verebes
— Kyril Balinin's Aide
George Sorel
— Baron Kruposny
Rick Vallin
— Dovkin