Season 4, Episode 21 -  Air Date: 4/16/2012
4 Ratings


With his relationship with Beckett strained, Castle teams up with Detective Ethan Slaughter from the city‘s gang unit and puts Castle in extreme danger.

‘Castle‘ Recap: Heads are Gonna Roll

As the season of Castle gets closer to the end, Rick Castle gets thrown a few curveballs. Or more to the point; he gets himself thrown into a frantic gang drama, adorned with three severed heads in a duffel bag and a dead kid named Glitch. Castle is saddled with rogue cop Detective Ethan Slaughter (guest star Adam Baldwin, making a Firefly reunion with Nathan Fillion!), who in one day hands Castle a gun, gets him into a bar fight with very, very bad guys, and even ticks Castle off to the point of taking a couple punches on the chin himself.
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