Watch Castle Season 5 Episode 18 online via TV Fanatic with over 7 options to watch the Castle S5E18 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, TNT, and Verizon On Demand.
|YouTube Purchase||Watch Now|
|Google Play||Watch Now|
|Verizon On Demand||Watch Now|
We learn a lot more about Ryan on this episode of Castle, as the detective goes undercover.