Complete story — includes the ending
The League demands Oliver find and turn over Sara's killer in 48 hours or they will begin murdering Starling City citizens, a mission led by his old friend Maseo, who has joined the League. S.T.A.R. Labs sends Felicity the DNA results, which appear to match Oliver. Realizing that she has been lying, the Arrow confronts Thea, who demonstrates her fighting skills before escaping. Later, Merlyn informs Oliver that he drugged Thea, then manipulated her into killing Sara and not remembering it. Merlyn filmed the event as leverage to force Oliver to take the blame and challenge Ra's to a duel, something no one has dared do in 67 years. Oliver is overpowered by Ra's, who impales him and kicks him over the side of a cliff. Meanwhile, Laurel reveals Sara's death to her mother, Dinah, and convinces her not to tell Quentin. Dinah asks her to avenge Sara's murder. Ray shows the A.T.O.M. design to Felicity and states his intention to use the exosuit to protect the city as a vigilante. In flashbacks, Oliver and Maseo learn that Chien has stolen an engineered supervirus. Chien breaks into Maseo's house, overpowering and kidnapping Tatsu.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Arrow season 3. HTML formatting and reference markers removed. · Content license