When the most recent episode of The Flash ended Zoom brought a bunch of dangerous metahumans to Earth-1. They will be led by a character familiar to the interconnected DC comic based TV shows.

Katie Cassidy, who has played Laurel Lance – assistant district attorney and Black Canary – on Arrow will appear on The Flash. This time she’ll be Laurel Lance’s Earth-2 doppelganger the Black Siren. Photos released by The CW show Black Siren among other superpowered baddies in a fight against the Flash.

Photos also show Black Siren talking to Killer Frost and Reverb, both of who are currently dead. Granted, these could be flashbacks or they could possibly be back from the dead, which could make the Flash’s task much more difficult.