Arrow Season 4, Episode 12 : Unchained

The team faces off against a formidable villain nicknamed The Calculator. Meanwhile, Nyssa makes her move and Roy Harper returns to. Guest Stars: Colton Haynes, Celina Jade, Echo Kellum, Elysia Rotaru, Tom Amandes, Rila Fukushima, Katrina Law, Natasha Gayle, Parker Young, Dean Mckenzie, Jimmy Akingbola, Janet Kidder, Venus Terzo,

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