Catherine doesn't trust Mary. But will she go so far as to set her up with a fake plan to kill King Henry? Or does Catherine actually want Mary's help in ending the life of the crazy ruler of France?

It appears we're about to find out.

When Francis' life is in jeopardy due to the manic ways of the King of France, Catherine will form an unlikely alliance with Mary and propose that they kill him in Reign Season 1 Episode 21.

Francis wants one last chance to try to break through to his ailing father before any drastic measures are taken. Will he be successful in his attempts?

Elsewhere, Lola finds out the truth behind Lord Julien's motives and, overcome by love, she blindly protects him, putting herself in a dire situation and Bash finds a young boy who survived an encounter with the Darkness and lived to tell about it, making him want to defeat it even more.

Oh, the intrigue. The royal madness! There's kissing, too. Take a look for yourself!

Reign Photos from "Long Live the King"

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Remember, any time you want to revisit the madness, you can watch Reign online via TV Fanatic!

Carissa Pavlica is the managing editor and a staff writer and critic for TV Fanatic. She's a member of the Critic's Choice Association, enjoys mentoring writers, conversing with cats, and passionately discussing the nuances of television and film with anyone who will listen. Follow her on X and email her here at TV Fanatic.