Aired
April 16, 2012
Castle
Castle
Headhunters #S04E21
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
Episode 21 of Season 4 from Castle — available to stream in HD on any device.
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