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The mid-season finale of "Arrow" Season 5 certainly had many fans shocked. Team Arrow appeared to have defeated Prometheus (at last!), only to find out that Oliver Queen had actually killed Felicity's boyfriend Billy instead. So will the villain's identity finally be revealed in "Who Are You?" It looks like Prometheus will not only be identified in the "Arrow" Season 5 mid-season premiere; his connection to Talia al Ghul will also be unveiled when the show returns to The CW.

There are several theories surrounding Prometheus in "Arrow" Season 5. However, the most popular (and highly plausible) one appears to be the one suggesting that the villain is actually Oliver Queen's best friend Tommy Merlyn. Now it has been confirmed that the baddie's possible connection to Talia al Ghul will be revealed in the mid-season premiere titled "Who Are You?"

"Arrow" Season 5 showrunner Wendy Mericle recently shared a few details about the mid-season premiere, stating that Talia al Ghul will be an important character who could reveal Prometheus' true identity. The news was immediately met with speculations that Talia could be working with the villain all this time and might even be responsible for his arrival in Starling City.

But who is Talia al Ghul? Some fans believe that the character is hiding behind a secret identity and has already been introduced in "Arrow" Season 5. There is a theory that the midseason premiere will unveil Carly Pope's Susan Williams might actually be Talia, who is spying on Oliver Queen and Team Arrow for Prometheus.

Will Prometheus finally reveal his true identity in the "Arrow" Season 5 mid-season premiere? Is Talia al Ghul pretending to be Susan Williams to spy on Oliver Queen and the rest of Team Arrow? Find out when "Who Are You?" airs on The CW on January 25.