Nathan Fillion and Monet Mazur

Nathan Fillion and Monet Mazur pose here in a promotional photo for Castle. The latter plays the former character's ex-wife on the show.
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Demming and Beckett

Tom Demming will remain on Castle through the end of season two. He and Beckett get along well.
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Castle Crime Scene

Spioler alert! By the end of season two, Castle and Beckett will stop denying their feelings for one another.
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Detective vs. Detective

Beckett goes toe-to-toe with a robbery detective in this photo. He's played by Michael Trucco.
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Big Castle Guest Star

Michael Trucco makes his first appearance on Castle on April 19. He plays a detective that gets close to Beckett.
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Michael Trucco on Castle

Welcome to Castle, Michael Trucco. This actor debuts on the episode "Den of Thieves," playing a robbery detective.
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Bill Bellamy on Castle

Bill Bellamy plays a talk show host on the episode "The Late Shaft." Is he also a killer?
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Castle Kiss

First base alert! Castle kisses an actress, played by Kelly Carlson, in this scene.
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On a Talk Show

"They want me dead." That's what this talk show host whispers to Castle during a commercial break.
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Kelly Carlson on Castle

This is Kelly Carlson on Castle. Her characters gets cozy with the show's star.
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Fred Willard on Castle

Fred Willard guest stars on the Castle episode "The Late Shaft." He plays a sidekick to a talk show host.
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Tom Bergeron on Castle

Tom Bergeron guest stars on Castle in the role of a talk show host. But he isn't long for this world.
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Castle Quotes

I need time to stop being mad and you need time to figure out a way to be OK with this.

Alexis

I tried to stay in the car I really did.

Castle