Watch Elementary Season 6 Episode 21 online via TV Fanatic with over 7 options to watch the Elementary S6E21 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, Hulu Plus, and Verizon On Demand.
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On Elementary Season 6 Episode 21, Holmes and Watson face their greatest challenge that may end up destroying their partnership on the season finale.