Things are about to get crazy in Central City as Zoom leads an entire army of meta-humans to Earth-1 in order to take over the world and kill Barry Allen. We get some glimpses of that in the new trailer below, but easily the most interesting thing here is Cisco's glimpse at the future and The Flash's reaction to something Zoom does...could a fan-favourite character be about to meet their maker?
KATIE CASSIDY GUEST STARS AS BLACK SIREN – After Zoom (guest star Teddy Sears) unleashes an army of Earth-2 meta-humans on Central City, Barry (Grant Gustin) is shaken when he sees their leader is the Black Canary’s Earth-2 doppelganger, the Black Siren (guest star Katie Cassidy). Meanwhile, Wally (Keiynan Lonsdale) takes to the streets to help The Flash stop the meta-humans, which worries Joe (Jesse L. Martin). Iris (Candice Patton) and Henry (guest star John Wesley Shipp) are concerned about Barry taking on Zoom. Jesse Warn directed the episode with story by Greg Berlanti & Andrew Kreisberg and teleplay by Brooke Roberts & David Kob.