Castle - Season 4 Episode 21 Headhunters
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
- Genre: Drama, Crime
- Studio: ABC
- Keyword: new york city, police, writer, novelist, criminal investigation, female detective, homicide detective, criminal consultant, police procedural
- Cast: Nathan Fillion, Stana Katic, Molly C. Quinn, Jon Huertas, Seamus Dever, Susan Sullivan
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