SEASON FINALE — Mary (Adelaide Kane) makes a bold move to defend her reign in Scotland, which results in a battle royale with her cousin, Elizabeth. Lola is accused of a heinous crime and suffers the drastic consequences. Meanwhile, back in France, Catherine finds that Charles has returned a changed man after paying a price for his mother’s relentless quest for power.
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- Prince Henry returns, whom was last seen in Season 1, portrayed by a new actor.
- Adelaide Kane, Megan Follows and Torrance Coombs are the only 3 actors to appear in every episode of Season One, Two and Three of Reign.
- Real and fake images of Edinburgh Castle were used for the exterior shots.
- This marks Torrance Coombs, and Anna Popplewell last appearances as series regulars.