S3, E1: Queen Mary (Adelaide Kane) struggles to hold on to her power in Scotland amidst Queen Elizabeth's (Rachel Skarsten) campaign to sabotage her with the help of a new ally in Queen Catherine (Megan Follows). Meanwhile, with Francis' (Toby Regbo) fate at odds and Elizabeth distracted by temptation in her first love, Robert Dudley (Charlie Carrick), both queens struggle to rule. Torrance Coombs, Celina Sinden, Anna Popplewell, Jonathan Keltz, Craig Parker and Rose Williams star.