US cavalry officer James Laurence arrives at one of the Russian colonies to pave the way for the eventual American takeover of the territory. He faces resistance in the form of Prince Nikolai Balinin, who has no intention of weakening his despotic hold over the local peasants. The plot thickens when Laurence falls in love with Natalie Alanova, the wife of disgraced nobleman Count Igor Savin.
| Actor | Role |
|---|---|
 Nelson EddyCaptain Jim Laurence | Captain Jim Laurence |
 Ilona MasseyNatalia Alanova | Natalia Alanova |
 Joseph SchildkrautCount Igor Savin | Count Igor Savin |
 Elsa LanchesterPrincess 'Tanya' Tatiana | Princess 'Tanya' Tatiana |
 Hugo HaasPrince Nickolai Balinin | Prince Nickolai Balinin |
 Lenore UlricBaroness Kruposny | Baroness Kruposny |
 Peter WhitneyVolkoff Overseer | Volkoff Overseer |
 Tamara ShayneOlga Natalia's Maid | Olga Natalia's Maid |
 Ernö VerebesKyril Balinin's Aide | Kyril Balinin's Aide |
| GGeorge SorelBaron Kruposny | Baron Kruposny |
 Rick VallinDovkin | Dovkin |