Watch The Flash Season 4 Episode 18 online via TV Fanatic with over 7 options to watch the The Flash S4E18 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, Netflix, YouTube Purchase, Google Play, and Verizon On Demand.
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On The Flash Season 4 Episode 18, Ralph considers crossing a dangerous line to defeat DeVoe, when the team finds a way to enter The Thinker's lair.