Who Are You? (Arrow)

"Someone once told me that a circumstance can make something poison or nectar. What they meant was we get to choose what we are, we get to choose who we are. So tell me... who are you?"

- Oliver to Black Siren

"Who Are You?" is the tenth episode of the fifth season of Arrow, and the one-hundred-and-second episode overall. It aired on January 25, 2017.

Synopsis
Worried that Prometheus is right and he is truly a killer at heart, Oliver looks for any ray of hope and finds it in what seems to be the miraculous return of Laurel Lance. However Felicity, still reeling from Detective Malone's murder, is bent on revenge - she wants to stop Prometheus at any cost. While in prison, John fights for his life.

Production
Preparation ran from October 12 until October 20, 2016. Filming ran from October 21 until November 1, 2016.

Trivia

 * While wondering how his doppelgänger on Earth Two could be different from him, Curtis asks to himself: "What if I'm straight?". This is a reference to his comic book counterpart, Michael Holt, who is heterosexual.
 * Before fighting, Wild Dog calls Black Siren "Trinity", a reference to Carrie Anne Moss' character in the Matrix trilogy, who wears a similar leather coat.
 * When Earth Two Laurel is telling Oliver her backstory she tells him "once you let the darkness inside it never comes out". This is similar to what Helena told Earth One Laurel in, which Earth One Laurel herself quoted to Kate Spencer when blackmailing her for her job back.
 * This episode establishes that Prometheus is aware of the existence of the multiverse and time travel, specifically the existence of the Waverider. This indicates that Prometheus has been keeping tabs on Team Flash and the Legends as well.