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凯瑟琳大帝
凯瑟琳和彼得在经历了一些看似无法解决的问题后，试图让他们的婚姻继续下去。彼得亲眼目睹自己被凯瑟琳谋杀未遂，凯瑟琳还囚禁了他所有的朋友。除此之外，彼得在凯瑟琳统治时期扮演的第一丈夫角色也让他无所适从，于是他开始忙于当父亲、打猎和烹饪。但这些并不能让他满足，因为他的脑海中总是浮现出已故父亲的影子，并对自己作为彼得大帝之子的失败感到愧疚。
Catherine and Peter seek some marriage guidance after the chaotic events of the previous day left them in an awkward place in their relationship.
Catherine is visited by the UK and US Ambassadors both wanting her to intervene in the War of Independence. Maxim takes issue with the public displays of affection between Grigor and Marial.
Catherine involves the peasants, nobles and merchants in a conference designed to bring change to Russia. Peter's hunt for revenge on an historic enemy threatens to destabilise Catherine's attempt to outlaw murder.
Arkady and Tatyana help Peter and Catherine through a rough patch as they clash over their son Paul. Catherine fears Paul will grow up to be a ruthless and careless leader and Archie and Elizabeth are alarmed when Catherine refuses to ordain him.
Peter is once again tormented by his father, Peter the Great's expectations and his failure to continue the legacy of his empire. Catherine must decide what to do about the unrest being stirred up in the regions, but Velementov is in no state to help her.
Catherine tries to persuade Peter to come home whilst Hugo re-doubles his attempts to regain his kingdom. Georgina continues to play her complicated court games.
Catherine wants to bring more fun to the court. With Georgina's help she stages a festival of truth, jokes and stunningly clever ideas. Katya puts on a play that challenges Catherine's reign, and Catherine samples Peter's invention of salty desserts.
Catherine introduces divorce to the court with unforeseen consequences. Grigor befriends Maxim and goes stag hunting, and Elizabeth and Petrov go on a trip to the regions.
Under orders from Catherine, Grigor hides out in the forest with Paul. Catherine plays a dangerous game with herself to prove that her destiny lies in Russia, and grapples with the impact Peter's decisions have on her rule.
Catherine meets court scientist Nikolai, who announces a comet is about to pass through Russia. She uses this phenomenon to her advantage and in the face of some huge challenges, unearths a new side of her leadership.
