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Watch Castle Season 6 Episode 21 online via TV Fanatic with over 7 options to watch the Castle S6E21 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, Xfinity, and TNT.
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Castle and Beckett dive into the world of death defying stunts when a mysterious motorcyclist guns down and up-and-coming skateboarder on Castle.