Watch Castle Season 8 Episode 21 online via TV Fanatic with over 6 options to watch the Castle S8E21 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, and Verizon On Demand.
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On Castle Season 8 Episode 21, an axe-wielding, escaped inmate turns up dead and theinvestigation leads Castle to suspect it could be the work of the Antichrist.