Castle Review: What Did You Think of Castle Season 4, Episode 21: "Headhunters"?

Tonight's all-new hour of Castle was one of the most-hyped episodes of the entire season. For the first time in 10 years, Firefly co-stars Nathan Fillion and Adam Baldwin were back on the small screen together, kicking ass and taking names. Or, in Nathan's case, more like getting his ass kicked. In Season 4, Episode 21: "Headhunters," mystery writer Rick Castle learns that the grass isn't always greener in another detective's yard. After riding dirty with notorious gang unit detective Ethan...


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