Who came out on top?
On Reign Season 3 Episode 18, Mary had to battle Elizabeth in order to secure her crown in Scotland.
Meanwhile on this addictive CW drama, Lola was accused of an awful crime and faced punishment for it.
Also, Catherine found that a very different Charles returned to France, but did she manage to worm her way back in with him before it was too late?
Use the video above to watch Reign online to get up to speed with the latest drama as the season concludes.
Paul Dailly is a staff writer for TV Fanatic. Follow him on Twitter.