The Flash Katie Cassidy

The Flash Enlists Arrow's Katie Cassidy to Appear as Earth-Two's [Spoiler]

The Flash‘s doppelgängers keep on coming.

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.

Arrow/Flash fans, do you think Laurel will be on the dark side over there, just like Caitlin and Cisco?