Complete story — includes the ending
During the S.T.A.R. Labs incident, Central City Police Department (CCPD) undercover officer Tina Boland develops a sonic scream after watching her partner die at the hands of drug dealer Sean Sonus. In the present day, Chase tells Oliver that the NSA had been investigating Walker, but its file has disappeared. While Felicity tries to locate it, Oliver takes Rene and Curtis to Hub City to recruit Tina. She initially refuses to join, but the team intercepts her attacking Sonus, who is also a metahuman with sonic powers. Sonus escapes and Oliver reveals his identity to convince Tina to let him help her. Oliver's team helps her defeat the dealers during a shipment, but Oliver fails to dissuade her from killing Sonus. Meanwhile, Felicity meets with a hacktivist whom she inspired during her college days and receives the file against Walker along with a cache of other secret information. With the file, Chase manages to get John released. Tina meets Oliver and agrees to join the team, revealing that her real name is Dinah Drake. In flashbacks, Talia helps Oliver kill an important associate of Kovar's. She also urges Oliver to become the avenger his father wanted him to be for Starling City.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Arrow season 5. HTML formatting and reference markers removed. · Content license