Season
Season 8 Episode
- Season 4 Rise
- Season 4 Heroes & Villains
- Season 4 Head Case
- Season 4 Kick the Ballistics
- Season 4 Eye of the Beholder
- Season 4 Demons
- Season 4 Cops & Robbers
- Season 4 Heartbreak Hotel
- Season 4 Kill Shot
- Season 4 Cuffed
- Season 4 Till Death Do Us Part
- Season 4 Dial M for Mayor
- Season 4 An Embarrassment of Bitches
- Season 4 The Blue Butterfly
- Season 4 Pandora (1)
- Season 4 Linchpin (2)
- Season 4 Once Upon a Crime
- Season 4 A Dance with Death
- Season 4 47 Seconds
- Season 4 The Limey
- Season 4 Headhunters
- Season 4 Undead Again
- Season 4 Always
Castle - Season 4 Episode 21 Headhunters
7.98 45 minutes 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
