On September 20, 2026
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Castle · S4E21 — Headhunters
Synopsis
As friction mounts between Castle and Beckett, Castle is assigned a new partner: Detective Ethan Slaughter (guest star Adam Baldwin, of "Firefly"), a hardened and unconventional officer from the city's gang unit. Slaughter reveals a darker aspect of police work, one that thrusts Castle into unforeseen danger.
