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

I can't help it if you got off by putting things in my mouth.

Beckett

Beckett: (Clears throat) Ahem. What's the deal with men and boobs, anyway?
Castle: Biological. We can't help it.
Beckett: But doesn't it bother you that they're so obviously not real?
Castle: (Pauses) Santa's not real. We still love opening his presents.