I think that we’re going to be able to learn more and more about Black Siren and Black Siren’s backstory.
We also know that Black Siren will be back on the show, with Katie Cassidy once again a series regular.
While bringing Black Siren onto Legends of Tomorrow would let Black Siren and White Canary go face to face, there’s also plenty of avenues that the time travel show could use to pit Earth-1 Laurel against her evil doppelgänger.
CBR were on hand during Comic-Con when Cassidy spoke more about the sides of Black Siren that will be explored this year.