Arrow Season 4 Episode 12“Unchained”

The CW · S4E12 · Aired February 3, 2016 · 60 min · ★ 7/10

Roy returns to Star City... working for a new villain, the Calculator, a genius computer hacker who plans to bring the city to its knees. Meanwhile, Thea's condition worsens, and in the past, Oliver takes the first step to leaving his darkness behind.

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