Castle Season 4 Episode 21
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
Serie: Castle
Director: John Terlesky
Guest Star: Adam Baldwin, Anna Zielinski, Christopher Rivera, Clifford McGhee, Jan M. Janssen, Mario Ardila Jr., Michael Dorn, Michael McGrady, Miles Tagtmeyer, Reynaldo Gallegos, Stefan Niemczyk