Castle Season 4 Episode 21 Headhunters ( Air Date 2012-04-16 ) Genre Drama, Crime category. Overview "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".
Castle Season 4 Episode 21 Headhunters
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- Watch: Castle Season 4 Episode 21 Headhunters on CWR-CRB
- Stars: Nathan Fillion, Stana Katic, Molly C. Quinn, Jon Huertas, Seamus Dever, Susan Sullivan, Tamala Jones, Toks Olagundoye
- Director: Zach Cannon, Alexi Hawley, Terence Paul Winter, Mark S. Glick, Nathan Fillion, Barry O'Brien, Stana Katic, Chad Gomez Creasey, Jim Adler, Rob Hanning, Christine Roum, Marc A. Kahn, Luke Reichle, Kendra Castleberry, Howard Grigsby, Andrew W. Marlowe, Rob Bowman, Donna Rosenstein, Armyan Bernstein, Tiffany Cowsill
