Watch Castle Season 6 Episode 20 online to see Rick and Kate go all 1970s on us.
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Watch Castle Season 6 Episode 20 online to see what Castle and company would have looked like in the 1970s.
When the body of an infamous mobster who disappeared in the 1970s is found, Castle and Beckett find one remaining witness. But since he still believes it's the '70s, they must act like his delusion is real in order to find their killer.