Preview Clip: Rick Gets a Dose of Reality in Castle Season 4, Episode 21: "Headhunters" (VIDEO) Tweet April 13, 2012 by Wetpaint Entertainment Staff Related: Castle, Sneak Peeks , Previews , Season 4 Episode 21 Credit: ABC You're not in Kansas anymore, Castle. Makes working with Kate Beckett kinda seem like a walk in the park, doesn't it? Original Air Date: Castle Season 4, Episode 21: "Headhunters" airs on Monday, April 16, 2012 at 10 p.m. ET on ABC
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