Catherine and Potemkin experience growing pains in their relationship, as Potemkin's push for expansion puts him at odds with Panin.

Cast: Helen Mirren, Georgina Beedle, Camilla Borghesani, Antonia Clarke, Thomas Doherty, Phil Dunster, Adam El Hagar, Rory Kinnear, Tom Lawrence, Gina McKee, James Northcote, Andrew Rothney, Aziz Çapkurt