Black Siren (Arrowverse)

""Laurel Lance is dead. On this Earth anyway. Poor Black Canary, bye-bye birdie.""

- Black Siren to The Flash.

Laurel Lance, also known as "Black Siren", is a recurring villain in the Arrowverse first appearing in The Flash and later in Arrow. Laurel is the evil Earth-2 counterpart of Laurel Lance/Black Canary but unlike her Earth-1 counterpart, this Laurel is a meta-human with the power of sonic screams without the use of a Canary Cry collar.

She is portrayed by Katie Cassidy.

Early life
Much of Laurel's early life is unknown and up for debate. It's possible given the life of her Earth-1 counterpart that Laurel may have lived in Starling City and dated Oliver Queen. However since Oliver died on Earth-2, which implies that Earth-2 Sara also died if she even existed, Laurel presumably didn't have the same closure her Earth-1 counterpart did in light of this tragedy.

Becoming Black Siren
Around December 2013 Laurel was one of the many Central City residents affected by Harrison Wells' particle accelerator, and gained the power to emit sonic screams powerful enough to kill people within seconds and take down entire buildings. Following this, she became a criminal named "Black Siren" and was employed into Hunter Zolomon/Zoom's army. She was one of his enforcers in Central City known for demolishing buildings. At some point she emerged as a high-ranking lieutenant of Zoom, earning enough respect from Hunter that he was willing to converse without a mask. This made Laurel the only known Earth Two individual to be aware of Hunter's identity and his "Jay Garrick" deception.

Invading Earth-1
As part of his plan to conquer Earth-1, Zoom brought over his entire army of meta-humans which included Laurel whom he ordered to attack various buildings at random to lure out the Flash. Laurel also learned of her Earth-1 doppelgänger's death, yet felt little remorse for her. Black Siren first attacked Mercury Labs and leveled the entire building, but the Flash was able to save everyone inside. Next, Black Siren lured out the Flash into the streets. At first Flash mistook her for her Earth One double though she simply laughed at him and elaborated that she was from Earth Two, and attacked him. Black Siren used her sonic cry to weaken the Flash and then physically attacked him and easily subdued him, but before she could kill him, Wally West ran his car into her and helped the Flash escape.

Black Siren later met up with Hunter at the Central City Police Department precinct, bragging of her defeat of the Flash but questioned why she was attacking buildings at random. Hunter explained that he needed the Flash distracted so that he wouldn't see his real plan coming until it was too late. When Black Siren asked what he was up to Hunter coldly replied "no good", leaving Black Siren visibly disturbed.

Black Siren, as instructed, went to demolish another building but was confronted by "Reverb" and "Killer Frost", much to her as she believed them dead. "Reverb" and "Killer Frost" seemingly made an offer to overthrow Zoom by teaming up together and Black Siren appeared to consider the offer, but was skeptical and tossed a brick to "Reverb". When he caught it with his right hand, Black Siren realized that "Reverb" and "Killer Frost" where actually their Earth One doubles Vibe and Earth One Caitlin Snow. As Black Siren tried to kill them, Vibe hit her with a sonic blast, activated subconsciously, and was unable to do so again. Unfazed, Black Siren simply tried to kill them again, but was disoriented and knocked out by a device Harry set up to render all Earth-2 individuals unconscious.

After falling unconscious, Black Siren was locked up in the S.T.A.R. Labs particle accelerator, where she attempted to get out, though her sonic scream had no effect on the soundproof cell, to which Vibe mocked her. Caitlin considered telling Sara and Quentin, the sister and father of her deceased Earth One counterpart, about Earth Two Laurel, but Barry voted against the idea, not wanting to ruin their memory of the Laurel they knew.

Infiltrating Team Arrow
Somehow Laurel escaped without Team Flash's knowledge and fled to Star City where she began impersonating her Earth-1 counterpart for reasons unclear. After Oliver Queen returned to the Arrowcave, grief stricken from having killed Billy Malone by accident, Laurel was standing there waiting for him and said "Hi Ollie". This left Oliver stunned as he believed she was Earth-1 Laurel. Later she was "welcomed home" with the other members of Team Arrow and brought up to speed on what she's "missed". However she later attacked them while in the Arrowcave and Oliver realized she wasn't their Laurel, which Laurel-2 was relieved to see someone had finally realized her deception.

Trivia
Like the DC comic version of Black Canary, Laurel possesses the meta-human ability of a super sonic scream, which she can deploy to shatter objects and incapacitate her opponent; however, unlike her Earth One counterpart, she is a villain, instead of a hero. She is the second Doppelgänger of an Arrow character that has appeared on The Flash. The first one was Floyd Lawton. She is also the first doppelgänger to appear in Arrow.
 * In DCAU, Black Siren is the alias of Donna Nance, a founding member of the Justice Guild of America, in an alternate Earth, from the TV series, Justice League. The character herself was actually based on the Golden Age Black Canary.
 * Despite being a villain many fans have noted similarties between Black Siren and the traditional Black Canary in the comics that make her arguably a more faithful adaptaion of the character than the Arrowverse's actual Black Canary.
 * She has the sonic scream as a meta-human power
 * She originates from Earth-2
 * She has fishnets on her suit
 * Her suit also greatly resembles the New 52 version of Black Canary's suit.
 * Fans have speculated that Black Siren may have some form of redemption storyline that leads to her becoming the next Black Canary, as Black Canary herself made Green Arrow promise not to let her be the last Canary of Star City before her death.