In the penultimate episode of Season 2, Black Siren leads Zoom's army of meta-humans from Earth-2, while Wally comes to Barry's aid to take on the assault on Central City.
Check out the promo for May 17's "Invincible" below:
THE FLASH "Invincible" - (8:00-9:00 p.m. ET) (Content Rating TBD) (HDTV)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).â€‚â€‚Meanwhile, Wally (Keiynan Lonsdale) takes to the streets to help The Flash stop the meta-humans, which worries Joe (Jesse L. Martin).â€‚â€‚Iris (Candice Patton) and Henry (guest star John Wesley Shipp) are concerned about Barry taking on Zoom.â€‚â€‚Jesse Warn directed the episode with story by Greg Berlanti & Andrew Kreisberg and teleplay by Brooke Roberts & David Kob (#222).â€‚â€‚Original airdate 5/17/2016.
"The Flash" airs Thursdays at 8/7c on The CW.