Castle

Mondays 10:00 PM on ABC
Castle
Ready to brawl
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Watch Castle Season 4 Episode 21 online via TV Fanatic with over 5 options to watch the Castle S4E21 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, and Google Play.

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Episode Details

It's a Firefly reunion on Castle this week, as Adam Baldwin guest stars in the fun role of Detective Ethan Slaughter.


Rating: 4.6 / 5.0 (283 Votes)
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Episode Number:
21

Castle Season 4 Episode 21 Quotes

Forget severed heads, I want to meet that guy!

Castle

Martha: Playing with dolls, are we?
Castle: They are action figures.