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Castle
Season 4 · Episode 21
Headhunters
8.144mApril 16, 2012
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
Episodes
- Episode 1Rise
- Episode 2Heroes & Villains
- Episode 3Head Case
- Episode 4Kick the Ballistics
- Episode 5Eye of the Beholder
- Episode 6Demons
- Episode 7Cops & Robbers
- Episode 8Heartbreak Hotel
- Episode 9Kill Shot
- Episode 10Cuffed
- Episode 11Till Death Do Us Part
- Episode 12Dial M for Mayor
- Episode 13An Embarrassment of Bitches
- Episode 14The Blue Butterfly
- Episode 15Pandora (1)
- Episode 16Linchpin (2)
- Episode 17Once Upon a Crime
- Episode 18A Dance with Death
- Episode 1947 Seconds
- Episode 20The Limey
- Episode 21Headhunters
- Episode 22Undead Again
- Episode 23Always