SPOILER WARNING: This article contains major spoilers for "Who Are You?", the mid-season premiere of "Arrow."
Laurel Lance may be back, but that's no reason to celebrate. In "Who Are You", the mid-season premiere of "Arrow," Laurel arrived in the bunker as if it were a miracle, but her story about being rescued through the power of time travel was anything but. As it turns out, this Laurel is actually the Black Siren of Earth-2, Laurel's evil doppelganger, who initially made her "Arrow"-verse debut in "The Flash" Season 2.
What's worse, Black Siren wasn't operating alone. Prometheus broke her out of Team Flash's pipeline, where they hold Barry's foes through the power of mutahuman dampening technology. As he promised in earlier episodes, Prometheus wants Oliver to suffer; as such, he used a Laurel lookalike to bring Oliver pain, in that she reminded him of the losses he had suffered during his time as the Green Arrow -- and that's exactly what Black Siren did.
Black Canary used Laurel's appearance to try to manipulate Oliver, but Felicity saw right through her act. She freed Black Siren soon after they had captured her so that she would lead them right back to Prometheus. The move worked, but could have cost Felicity her life, thereby concerning Oliver. As such, it seems that Felicity has become more reckless, which may indicate the dark direction she will take in the wake of her boyfriend Billy Malone's death.
As Felicity and Curtis tracked down Black Siren, Oliver came to blows with Prometheus. Ultimately, though, Oliver had to make a choice between capturing Prometheus and saving Felicity. Obviously, Oliver chose the latter, and -- with a little help from Mr. Terrific and his technology -- they were able to capture Black Siren once and for all. At the end of the episode, Team Arrow shipped Black Siren back to Central City, where she'll be imprisoned once more.
But that doesn't mean the legacy of Black Canary died with Laurel Lance. At the end of the episode, the show introduced a woman who appears to have very similar powers to Black Siren, in that she seems to have a sonic scream. As the promo for next week's episode shows Green Arrow, Ragman and Mr. Terrific speaking to her, they will likely try to convince her to join the team. After all, Oliver promised Laurel that he wouldn't let her legacy die with her.
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Additionally, the episode introduced Talia al Ghul in the flashbacks to Oliver's time in Russia. As he was being tortured by a member of the Bratva, she attacked the facility where he was being kept, then informed him that she had been looking for him. It is unclear how or why she wants Oliver.
Starring Stephen Amell as the Emerald Archer, “Arrow” airs at 8 pm ET/PT on The CW. The series also stars Emily Bett Rickards, David Ramsey, John Barrowman, Willa Holland and more. “Arrow’s” fifth season returns to the CW on January 25.