The Flash Season 2 – Katie Cassidy to Guest as Black Siren

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