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Castle Photo Gallery: A Groovy Kind of Case

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When a construction crew digs up the body of an infamous mobster last seen in the 1970s, the team at the 12th precinct finds itself trying to solve a murder over three decades old on Castle Season 6 Episode 20.

But when the only possible witness lives with the delusion that it's still 1970-something, Castle, Beckett and the gang go all in to play into his reality in the hopes of catching the killer.

Check out these totally groovy outfits and far out hairstyles in these photos from "That '70s Show."

Stepping Back
The gang at the 12th precinct go all out in the hopes that a delusional witness will lead them to a killer on Castle. "That '70s Show" is the 20th episode of the show's sixth season.

Also, don't forget that when you need your fix, you can always watch Castle online here at TV Fanatic.

C. Orlando is a TV Fanatic Staff Writer. Follow her on Twitter.

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Castle Season 6 Episode 20 Quotes

Harold: Have you ever seen a cop with an ass that fine. If this women's lib I'm all for it.
Castle: To be fair, you do have a very fine, never mind.

A testament to the truly indestructible nature of polyester.

Castle

Castle Season 6 Episode 20 Music

  Song Artist
Donna summer last dance Last Dance Donna Summer iTunes
Walter murphy a fifth of beethoven A Fifth of Beethoven Walter Murphy iTunes
Silver convention get up and boogie thats right Get Up And Boogie (That'S Right) Silver Convention iTunes