Castle Season 4 Episode 21 Headhunters 2011
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With tensions rising between Castle and Beckett, Castle finds himself a new partner -- Detective Ethan Slaughter (guest star Adam Baldwin, "Firefly"), a tough and colorful cop from the city's gang unit. But Castle gets more than he bargained for when Slaughter shows him a grittier side of police work that puts Castle in the line of fire like never before
- Released: 2012-04-16
- Runtime: 45 minutes
- Genre: Drama, Crime
- Stars: Nathan Fillion, Stana Katic, Molly C. Quinn, Jon Huertas, Seamus Dever
- Director: Zach Cannon, Barry O'Brien, Mark S. Glick, Nathan Fillion, Terence Paul Winter
