• Katie Cassidy

Katie Cassidy (Photo : The CW)

"The Flash" season 2 will give fans the opportunity to see Katie Cassidy once again, six weeks after her departure from "Arrow" season 4 was announced.

According to TV Line, Cassidy will play the role of Black Siren in the upcoming episode of "The Flash" season 2.

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In "Invincible," the villainous character Zoom (Jay Garrick) will unleash a slew of Earth-Two metahumans in Central City and the pack will be led by none other than Black Canary's doppelganger Black Siren.

A photo from the upcoming episode also showed Cassidy wearing her Black Siren suit and by the looks of it, she will be making her infamous siren-like noise in the installment.

The Black Siren will also be joined by Cisco (Carlos Valdes) and Caitlin's (Danielle Panabaker) Earth-Two counterparts Reverb and Killer Frost.

While speaking with the publication, Valdes shared his excitement over working with Cassidy on "The Flash" and not on "Arrow." After all, Cassidy's Black Canary has already been killed off, and viewers have been urging the producers of the show to give the opportunity to return in the franchise.

"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," he said.

Meanwhile, "Invincible" will also see Wally West (Keiynan Lonsdale) helping Barry Allen/The Flash (Grant Gustin).

In the previous episode, The Flash decided to give up his speed to Zoom so the latter would free Wally. At that time, Wally felt so bad over The Flash's decision because he knew that he could not save anyone without his speed.

On Tuesday night, Wally and The Flash will develop a close working relationship with each other that will worry the former's biological dad Joe. Iris (Candice Patton) and Henry will also be very concerned with Barry's decision to fight Zoom.

"The Flash" season 2, episode 22 will air on The CW on May 17 at 8 p.m. ET.

Check out the official teaser for "Invincible" below!