Castle — Headhunters (S4 E21)

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

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Cast: Nathan Fillion, Stana Katic, Molly C. Quinn, Jon Huertas, Seamus Dever, Susan Sullivan, Tamala Jones, Toks Olagundoye

Original title

Castle

Genres

Drama · Crime

Release date

2012-04-16

Rating

8.1/10

Runtime

44 min

Status

Canceled

Production countries

United States of America

Seasons

8

Episodes

173

Networks

ABC