Here’s the official synopsis for the second-last episode of the season, due to air on May 17th. More (including spoilers) behind the jump.
“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). 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 (#222). Original airdate 5/17/2016
Things are obviously heating up before the season finale on May 24th! Who’s looking forward to this last arc and the final showdown with Zoom?