As the war with Sweden continues to rage, Catherine and Aunt Elizabeth visit the military at the Russian front. Seeing the soldiers reminds Catherine of her goal to rule Russia differently. Grigor struggles with Peter and Georgina's relationship and poisons Peter to end it. When Peter falls ill, Velementov, Orlo, and Marial all try to influence Catherine's steps toward takeover as Peter's life hangs in the balance.
Elenco: Elle Fanning , Nicholas Hoult , Phoebe Fox , Sacha Dhawan , Charity Wakefield , Gwilym Lee , Adam Godley , Douglas Hodge , Belinda Bromilow , Bayo Gbadamosi .