| Katie Cassidy's Black Siren Leads An Army In Flash Synopsis |
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| Friday, 29 April 2016 14:01 |
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"Arrow" alum Katie Cassidy returns to "The Flash" in "Invincible," an episode featuring a number of evil metahumans from Earth-2. Read more: http://www.comicbookresources.com/article/katie-cassidys-black-siren-leads-army-flash-synopsis |