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'The Flash' season 2 spoilers, plot news: Katie Cassidy to play Zoom's lieutenant Black Siren

A scene from \"The Flash\" season 2 episode 22. | Image: Courtesy of The CW

Hit superhero series "The Flash" only has one episode left before the much-anticipated sophomore season-ender airs next week, and fans will witness yet another action-packed episode tomorrow.

According to spoilers for tomorrow's episode 22 titled "Invincible," fans will see Katie Cassidy's return. Viewers of "Arrow" know that Laurel died in season 4, and there are speculations that she will come back from the grave. Stephen Arnell already confirmed that she won't re-appear in "Arrow," but her doppelganger on Earth-2 will surely make a comeback. Cassidy will play the role of Black Siren, Zoom's (Teddy Sears) trusted lieutenant. New photos were also released for episode 22, suggesting that Zoom brought back other Earth-2 metahumans from the dead â€” Reverb (Carlos Valdes) and Killer Frost (Danielle Panabaker). Valdes gave his take on Cassidy's return via TV Line, saying, "Laurel's death is pretty ubiquitous in this DC TV universe [so to see] a version of Laurel that's alive, that does things to somebody's consciousness, especially after processing grief. There's definitely a bit of shock there and difficulty grappling with reality."

Elsewhere, Wally (Keiynan Lonsdale) does what he can in order to help The Flash (Grant Gustin) causing Joe (Jesse L. Martin) to worry, while Henry (John Wesley Shipp) and Iris (Candice Patton) fear for Barry's life as he will be fighting Zoom.

The official synopsis for tomorrow's episode reads:

"After Zoom unleashes an army of Earth-2 meta-humans on Central City, Barry is shaken when he sees their leader is the Black Canary's Earth-2 doppelgänger, the Black Siren. Meanwhile, Wally takes to the streets to help the Flash stop the meta-humans, which worries Joe; and Iris and Henry become concerned about Barry taking on Zoom."

On another note, episode 21 director Kevin Smith recently teased about what's to come in the last two episodes of the series. "I saw that breakdown and was like [gasps]," the director said in his "Fatman On Batman" podcast.  "And then for what they decided to do for the absolute finale... it was kind of mad s--t as well. It's crazy. Like this is a show that ends big."

Stay tuned for the last two episodes of "The Flash" which airs every Tuesday at 8 p.m. on The CW.