The Flash - Season 2 - Katie Cassidy to Guest as Black Siren + 2 Part Season Finale *Updated*

Update: The Flash - Season 2 - To Have a 2 Part Episode Season Finale
Thanks to Lilah for the heads up.

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Thanks to Lilah for the heads up.

Arrow star Katie Cassidy will guest-star on the spinoff as the Earth-Two version of Laurel Lance, Arrow executive producer Marc Guggenheim confirmed at a Monday press screening.

In the parallel universe, Laurel takes on the moniker of Black Siren, who was a member of the Justice Society and the mother of Dinah Laurel Lance in the DC Comics canon.

Cassidy appears in The Flash‘s penultimate Season 2 installment, airing May 17.

Source:

TVLine