Caterina finds out that her husband Peter Tzar of Russia, is plotting to kill her. She sets Count Orlov free from prison, Peter's sworn enemy, becomes empress of Russia and leads the Cossacks army against him.
| Actor | Role |
|---|---|
 Hildegard KnefCatherine the Great | Catherine the Great |
 Sergio FantoniOrloff | Orloff |
 Giacomo Rossi StuartCount Poniatowski | Count Poniatowski |
| ÁÁngela CavoAnna | Anna |
 Ennio Balboconte Panin | conte Panin |
 Leonardo BottaSaltikoff | Saltikoff |
 Raoul GrassilliCzar Peter III | Czar Peter III |
 Tina LattanziCzarina Elizabeth | Czarina Elizabeth |
 Vera BesussoPrincess Woronzoff | Princess Woronzoff |
 Gianni Solarocapitano Shvering | capitano Shvering |
 Enzo Fiermontegenerale Munich | generale Munich |
| RRomano GhiniAlan Orloff | Alan Orloff |
 Tullio AltamuraNot listed | Not listed |
 Janez VrhovecNot listed | Not listed |
 Franco JamonteNot listed | Not listed |
| GG. VoujakliaNot listed | Not listed |
 Bernard FarberNot listed | Not listed |
| LLuigi D'AcriNot listed | Not listed |