'Arrow's' Marc Guggenheim On S6's Family Theme, The Vigilante Mystery & More

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In the "Arrow" press room at Comic-Con 2017, Executive Producer Marc Guggenheim explains more about "family" being the theme of Season 6. Then, Marc reveals more about how flashbacks will work this season. And, Marc talks the Vigilante mystery and having Katie Cassidy back as Black Siren.

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