After the awesome Earth-2 episodes of The Flash, we’re finally going to see some Arrow doppelgangers! Entertainment Weekly is reporting that Katie Cassidy will guest star as Black Siren, a Justice League Animated character, in the show’s second to last episode of the season. Hopefully, we see some more of Earth-2 in season three!
— Lia [D-15] (@Diva_Jong) April 1, 2016
The Flash airs Tuesday’s on The CW