It's the season finale that will change Castle forever. Intriguing enough for you? Watch the official ABC promo now.
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Only one episode remains until the Castle season 4 finale. Check out this look ahead to "Undead Again" now.
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Is there any medical way to determine if someone was a zombie? Castle asks this key question in this clip from "Undead Again."
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Castle pays Beckett a visit in this clip from the episode "Headhunters." Which makes her happy, until she learns why.
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Get a look here at Adam Baldwin on Castle. His detective comes between Rick and Kate a bit, as previewed in this clip from "Headhunters."
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It's a Firefly reunion! Adam Baldwin guest stars on this episode of Castle, as the title character and Beckett move farther apart. Watch now.
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You tell her, Lanie! Beckett receives solid advice from her pal in this scene from the Castle episode "The Limey."
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Beckett is undercover, and looking gorgeous, in this clip from the Castle episode "The Limey." Watch her leading on the dance floor now.
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Castle Quotes

Sometimes the hardest things in life are the things most worth doing.

Castle

The moment we met my life became extraordinary. You taught me more about myself than I knew there was to learn. You are the joy in my heart. You are the last person I want to see every night before I close my eyes. I love you Katherine Beckett and the mystery of you is the one I want to spend the rest of my life exploring. I promise to love you, to be your friend and your partner in crime and life till death do us part and for the time of our lives.

Rick Castle