Reign: John Barrowman Plays a Powerful Scotsman Who Threatens Mary's Crown

Shawna Malcom
Reign, Adelaide Kane, John Barrowman
Sven Frenzel/The CW

So much for a happy homecoming. Back in her native Scotland in the June 13 episode of The CW’s Reign, Mary (Adelaide Kane) meets Munro (guest star John Barrowman, of Arrow), a powerful Scottish clan leader who poses a threat to the queen’s crown—and who was ultimately responsible for her husband Francis’s death.

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“Mary’s out for vengeance,” says exec producer Laurie McCarthy, who describes Mary and Munro’s first meeting as “raucous and uninhibited.”

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Munro is very similar to Barrowman himself, according to McCarthy: “The actor is so charming, lively and funny that I wanted a character who really lived up to that.” She promises the episode will be memorable: “They meet again at a party, and there will be violence.”

Reign, Mondays, 8/7c, The CW.