Arrow season 1 episod 12
Watch online episod 12 – "Vertigo"
At her arraignment, Thea attempts to enter into a plea bargain with the district attorney, but determined to set an example for the Vertigo drug dealers, the judge dismisses the plea and orders the charges brought to trial. In an attempt to help Thea, Oliver begins working on tracking down the supplier; he eventually discovers that the supplier goes by "The Count", and he arranges a meeting through his contacts with the Russian mob. The meeting is broken up by the police, and the Count injects Oliver with a concentrated dose of Vertigo when the latter attempts to follow him. While overdosing, Oliver has flashbacks to the island, and Yao Fei pretending to kill him in front of Fyers so that he can help Oliver to escape captivity. Diggle takes Oliver back to his hideout and uses medicinal herbs Oliver brought back with him from the island to fight the drug overdose. Afterward, Oliver has the drug analyzed and uses the ingredients to track the location of the Count. As the vigilante, Oliver is able to confront the Count and inject him with his own drug just as the police arrive as well. Laurel persuades her father to pull some strings and get Thea 2 years of probation and 500 hours of community service, which she begins serving at Laurel’s legal office. Additionally, Felicity shows Oliver the list of names that Walter discovered, and informs him that they came from his mother.