S1, E18: When Mary's brother James (guest star Joe Doyle) arrives in France and convinces Mary to return to Scotland, Francis is suspicious and uncovers a plot that would destroy Mary, which causes a rift between them. King Henry's downward spiral continues, leaving Penelope (guest star Kathryn Prescott) in charge, causing Catherine and Kenna to take drastic measures. Meanwhile, Lola becomes wary of Lord Julien's (guest star Giacomo Gianniotti) motives behind his marriage proposal. Alan Van Sprang, Torrance Coombs, Celina Sinden, Anna Popplewell and Caitlin Stasey also star.