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Castle S04E21

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Castle : Headhunters

S04, E21 ()

Castle takes on Detective Ethan Slaughter (Adam Baldwin) as his partner when tension between himself and Beckett rises, and he sees a new side to police work that puts him in danger.

TV-PG  (L, V)

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Previous Episode

The Limey

S04, E20 (First Aired: April 2, 2012)

An attractive detective from Scotland Yard (Brett Tucker) teams up with Castle and Beckett to investigate the murder of his friend's daughter; Lanie tries to talk Beckett into making a move on Castle.

Next Episode

Undead Again

S04, E22 (First Aired: April 30, 2012)

When a dead man is found with human bite marks on his body, a witness claims the deceased was attacked by a zombie.