After tracking Merlyn, Oliver agrees to meet him in a public location, where Merlyn tells Oliver that he did not kill her, but only returned to Starling City to save Thea.
Nyssa kidnaps Thea in an attempt to draw out Merlyn, known by the League as the "Magician"; but Oliver arrives to rescue Thea.
In flashbacks, Waller assigns agent Maseo Yamashiro as Oliver's handler. Oliver and Diggle manage to stop him, who convinces Diggle to tell Waller that he is dead.
After numerous failed attempts to escape, Oliver agrees to proceed with his training to prevent Waller from killing Maseo's family as punishment for his failure in restraining Oliver. Quentin alerts Oliver to another archer in the city killing people, unaware about Sara. After a last minute plea, and Oliver revealing the truth about Robert's death, Thea agrees to return, which Merlyn allows.
On January 8, 2017, The CW renewed the series for a sixth season, The newly promoted Captain Quentin Lance calls off the task-force against Arrow.Nyssa warns Oliver that he has made a serious enemy in the League before leaving and reporting back to Ra's. In flashbacks, Oliver completes his first assassination, and learns that Waller was behind Edward Fyers' actions on the island; and her intention was to kill Chien on a flight to Hong Kong.Since Oliver stopped the attack, Waller demands him to help her find out the reason of Chien's presence.To save Tommy, Oliver pretends to kidnap him and tricks him into thinking that it was a ruse to gain ransom money before Maseo, posing as a police officer, rescues Tommy. While he waits to convince her, Oliver assists Diggle on a mission for A. In flashbacks to six months prior, Merlyn begins training Thea to calm her mind and heal her emotional pain, while also mastering control over physical pain.With no more leads in Sara's murder, Oliver focuses his attention on bringing Thea home. Oliver informs Nyssa that Sara was killed; and Nyssa reveals to Oliver that Merlyn is alive and Sara was sent by the League to confirm his existence.