"Battles rage, kingdoms rise leading to the finale royale."

Everyone, stop what you are doing because we have an exclusive sneak peek at what the rest of Reign's freshman season holds and trust us when we say you are going to want to watch it ASAP.

The CW hit is pulling out all the stops as its first season comes to a close, including King Henry (Alan Van Sprang) waging a major war against England, Mary (Adelaide Kane) and Francis (Toby Regbo) sharing a tearful goodbye and Bash (Torrance Coombs) and Kenna (Caitlin Stasey) getting hot and heavy!

Yeah, you're going to want to press play on that exclusive video above right about now. Oh, and you'll also notice a certain fan favorite Battlestar Galactica star making a surprise appearance in the promo...

Tahmoh Penikett

Angela Weiss/Getty Images

E! Online can exclusively reveal that Tahmoh Penikett, also known for his turns on Dollhouse and, most recently, Supernatural, will guest star as John, a sexy nobleman visiting French Court that any lady would be happy to have. (Hey, Greer's not married yet?!) Alas, he also happens to be a mercenary for hire. And you can get your first look at Penikett, who will make his debut in the May 1 episode, in action, alongside Kane, in our exclusive promo above!

As for what's ahead for the remainder of Reign's insane-in-the-membrane season, star Adelaide Kane recently teased, "There's blood and guts and dying and fights and everything. Our last couple of episodes have these amazing battles, there's going to be returning heroes. There's going to be a couple of deaths, it's going to happen. We have some really, really big stuff coming up."

Reign's sure-to-be epic finale is set to air on Thursday, May 15. 

Reign airs Thursdays at 9 p.m. on the CW.

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