Oliver discovers Sara is alive when he investigates recent murders. With Felicity's help, they determine that Sara, who is still not herself, is looking for Thea and plans to kill her. Sara attacks Thea, who manages to escape. Later, the team captures Sara and Oliver calls an old friend, John Constantine, to help restore Sara's soul. Meanwhile, Darhk gives Captain Lance a new task to install a computer virus in a security company. Diggle goes along and sees his brother's name among the list of individuals being deleted by the virus. Later, Felicity learns that Ray is still alive, and Diggle learns that his brother was killed because he was a drug cartel leader. In flashbacks, Conklin brings Oliver to Reiter, who dismisses Oliver as a spy. Instead, he introduces them to recent captive John Constantine, who escapes and forces Oliver to help him locate a mystical object on the island. After, John warns Oliver after Reiter's real plans, and uses the object to cast a spell on Oliver for his protection.