Season 4, Episode 6
Air date October 24, 2011
Written by Rob Hanning
Directed by Bill Roe
Episode guide
Eye of the Beholder
Cops & Robbers
Season 4
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Demons is the sixth episode of the fourth season of Castle.


Castle and Beckett confront the possibility of paranormal foul play, when a world-renowned ghost hunter is mysteriously murdered while investigating a haunting at a legendary New York mansion.



Castle 4x06 Promo - "Demons" (HD)

Castle 4x06 Promo - "Demons" (HD)

Castle Season Epiosde Demons


Main Cast

Guest Cast


Beckett: Maybe Shaggy will keep Scooby out of trouble.
Castle: If you’re not scared, just say it.
Beckett: No.
Castle: C’mon. You know you want to.
Beckett: I don’t want to say it, Castle.
Castle: For me. Please.
Beckett: I ain't afraid of no ghosts.
Beckett: Okay, I'm gonna go up. Ready? Grab my legs. Castle, I said legs! Ok?
Castle: Oh, legs. Sorry.
Lanie: Not as sorry as I was. I'm around dead people all day. When I get home, I want a live one. 
Esposito: I was tired. 
Jenny: I can't believe we waited this long to do this, babe. 
Ryan: Yeah... yeah, it really did turn out to be a perfect night.
Ryan: Look, I said I'm sorry, okay? I didn't mean to jinx the dinner.
Esposito: "This really is the perfect night."
Ryan: Jenny got a little caught-up in the moment.
Esposito: "When are you two getting married?" That's a question you do not ask. All right, You know, It's--It's not entirely you guys' fault.
Ryan: You guys have a big fight after?
Esposito: Big fight? No.

Featured Music

  • "Ghostbusters" - Ray Parker, Jr


  • Castle says, "Well there was that last episode of The Sopranos," in reference to all the cameras shutting off right before the victim, Jack Sinclair, dies. This is when Tony Soprano, on the TV show The Sopranos, has the camera suddenly shut off on his last moments as the series ended, possibly implying his death.
  • Watch For: Kate's reaction when Pete Benton talks about what he was doing the night Melanie was killed. It's subtle, but it's there.
  • Lanie and Esposito officially end their relationship until Till Death Do Us Part in this episode after Jenny's innocent question about marriage causes a point-of-no-return fight between them.
  • Fredric Lehne, who played Detective Addison Smith, was known for playing the Yellow-Eyed Demon and Prince of Hell, Azazel on Supernatural. At the end of the episode, Beckett tells Castle that Smith claimed to be possessed by a demon.