Credit: Carol Kaelson/ABC Television Group © 2012 Disney Photo: Meredith Smiles in Castle Season 5, Episode 10: "Significant Others"

We’ve endured many long, cold, Castle-less weeks, but the wait is finally over: Our favorite show returns tonight, Jan. 7, 2013!

It’s time to ring in the new year with our favorite couple, and we’re in for a red-hot episode when Rick’s ex-wife, Meredith, drops by. As seen in the promo for Castle Season 5, Episode 10: “Significant Others,” both Kate and Mere stay at Rick’s apartment, and his place is far from a love shack! In fact, three is definitely a crowd — especially when Lanie Parrish questions if Castle will cheat on his lady love.

Episode 10 also features a dramatic lovers' quarrel with Weeds’  Brendan Ford and General Hospital’s Nancy Lee Grahn, plus Melrose Place’s Jack Wagner as a slightly-unhinged former pro golfer. We won’t spoil it all here, but to learn more about tonight’s ep, check out our sneak peeks and spoilers roundup!

Are you excited for tonight’s episode of Castle? Sound off below!

Original Air Date: Castle Season 5, Episode 10: “Significant Others” airs tonight, Monday, Jan. 7, 2013 at 10 p.m. ET on ABC.

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