CASTLE – Episode 4.21 – Headhunters – Promos

Nathan Fillion and Adam Baldwin in CASTLE - Episode 4.21 - Headhunters

Promo images and preview clips for CASTLE, episode 4.21, “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.

Featuring Adam Baldwin, Stana Katic, Nathan Fillion, Jon Huertas, Seamus Dever, Stefan Niemczyk, Christopher Rivera.

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