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The Flash preview: Katie Cassidy's Black Siren faces off against Barry

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Dean Buscher/The CW

Katie Cassidy returns to the Berlanti universe during Tuesday’s episode of The Flash — but she’s not the Laurel Lance we remember from Arrow.

In the wake of Laurel’s death, her Earth-2 doppelgänger Black Siren arrives on Earth-1 and plans to take down The Flash (Grant Gustin) for Zoom (Teddy Sears). Check out an exclusive sneak peek above.

The Flash airs Tuesdays at 8 p.m. ET on The CW.