Watch Once Upon a Time Season 5 Episode 4 online via TV Fanatic with over 7 options to watch the Once Upon a Time S5E4 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, Verizon On Demand, and Disney+.
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On Once Upon a Time Season 5 Episode 4, Mary Margaret must take matters into her own hands when she realizes Arthur may be the heroes’ biggest threat.