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BLACK SIREN KIDNAPS LANCE— Quentin Lance (Paul Blackthorne) is kidnaped by Black Siren (Katie Cassidy) and Cayden James (guest star Michael Emerson), who are looking to trade Lance’s life for a weapon of mass destruction. Oliver (Stephen Amell) and Team Green Arrow must figure out a way to save Lance while still keeping the city safe.  Laura Belsey directed the episode written by Beth Schwartz & Sarah Tarkoff (#609).  Original airdate 12/7/2017.
—  Episode Description for Arrow 6x09: Irreconcilable Differences

Next two confirmed episodes Black Siren is on:

Season 6 episode 7:

OLIVER AND FELICITY CELEBRATE THANKSGIVING WITH WILLIAM — Oliver (Stephen Amell) celebrates Thanksgiving with his family but the happy moment is interrupted. Meanwhile, Black Siren (Katie Cassidy) returns to wreak havoc on the holiday. Gord Verheul directed the episode written by Wendy Mericle & Speed Weed (#607). Original airdate 11/23/2017. (x)


Season 6 episode 9:

BLACK SIREN KIDNAPS LANCE— Quentin Lance (Paul Blackthorne) is kidnaped by Black Siren (Katie Cassidy) and Cayden James (guest star Michael Emerson), who are looking to trade Lance’s life for a weapon of mass destruction. Oliver (Stephen Amell) and Team Green Arrow must figure out a way to save Lance while still keeping the city safe. Laura Belsey directed the episode written by Beth Schwartz & Sarah Tarkoff (#609). Original airdate 12/7/2017. (x)

Arrow 6x09 ‘Irreconcilable Differences’ Episode Description

BLACK SIREN KIDNAPS LANCE— Quentin Lance (Paul Blackthorne) is kidnapped by Black Siren (Katie Cassidy) and Cayden James (guest star Michael Emerson), who are looking to trade Lance’s life for a weapon of mass destruction. Oliver (Stephen Amell) and Team Green Arrow must figure out a way to save Lance while still keeping the city safe. Laura Belsey directed the episode written by Beth Schwartz & Sarah Tarkoff (#609). Original airdate 12/7/2017.