"Undead Again"

A zombie attack on Castle?!? That's the theory that starts to fly on this season four episode.

  • 4.6 / 5.0
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"Headhunters"

It's a Firefly reunion on Castle this week, as Adam Baldwin guest stars in the fun role of Detective Ethan Slaughter.

  • 4.3 / 5.0
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"The Limey"

Brett Tucker guest stars this week as a detective from Scotland Yard. He teams up with Beckett and Castle on a personal case.

  • 4.6 / 5.0
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"47 Seconds"

A bomb goes off during a protest this week, causing Castle and Beckett to go back over the timeline of the event, and also to evaluate their lives.

  • 4.7 / 5.0
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"A Dance with Death"

Castle delves into the world of reality TV this week, as a contestant on "A Night of Dance" is murdered n her dressing room.

  • 4.4 / 5.0
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"Once Upon a Crime"

The detectives look into the deaths of women dressed as fairytale characters while Martha puts on a one woman show.

  • 4.4 / 5.0
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"Linchpin"

This is the conclusion of the annual two-parter. It features Castle and Beckett racing to stop a chain of dangerous events from unfolding.

  • 4.6 / 5.0
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"Pandora"

Castle and Beckett are after a killer this week, which leads them to a major conspiracy. Jennifer Beals guest stars.

  • 4.8 / 5.0
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"The Blue Butterfly"

Told through flashbacks, Castle and the detectives investigate a murder linked to a double homicide in the 1940's.

  • 4.7 / 5.0
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"An Embarrassment of Bitches"

The murder of a dog trainer/judge has Castle and Beckett looking into guest star Hilarie Burton's character, Kay Cappuccio, a character resembling reality star Kim Kardashian.

  • 4.6 / 5.0
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Castle Quotes

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

Castle

Castle: How do you know when you're in love?
Beckett: All the songs make sense.