Charles' coronation nears, forcing Mary to find a suitor who will be her ally. Meanwhile, Lola discovers who's been poisoning Elizabeth; and the castle's serial killer has special plans for Catherine.

Adelaide Kane
Mary Stuart

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Megan Follows
Catherine de' Medici

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Torrance Coombs
Sebastian

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Celina Sinden
Greer

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Craig Parker
Stéphane Narcisse

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Anna Popplewell
Lola

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Charlie Carrick
Robert Dudley

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Rachel Skarsten
Elizabeth I of England

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Spencer MacPherson
Charles IX of France

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Ben Geurens
Gideon Blackburn

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Guest stars