12. Vertigo

Complete story — includes the ending

The judge dismisses Thea's plea bargain and orders the charges brought to trial. Helping Thea, Oliver begins hunting down the supplier of the drug, which is known as Vertigo; he discovers the supplier is called " The Count " and arranges a meeting through his contacts with the Solntsevskaya Bratva. The meet is broken up by the police and the Count injects Oliver with a dose of Vertigo. While mid-overdose, the latter still continues his investigation. He uses the ingredients to track the location of the Count. As the vigilante, Oliver is able to confront the Count and inject him with Vertigo, causing irreparable damage. Laurel persuades Quentin to get Thea two years of probation along with community service, which she begins by working at Laurel's legal office. Felicity provides Oliver the list of names Steele discovered and informs him that they came from Moira. Flashbacks show Yao overpowering Oliver in a mandatory duel and making him appear dead. His body is thrown over a waterfall, where he wakes up and finds an upgraded map, planted by Yao.