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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It's a Firefly reunion on Castle this week, as Adam Baldwin guest stars in the fun role of Detective Ethan Slaughter.
Forget severed heads, I want to meet that guy!Castle
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Martha: Playing with dolls, are we?
Castle: They are action figures.
- Permalink: Playing with dolls, are we? They are action figures.