Vertigo


 * For the eponymous drug, see Vertigo (drug).

"Vertigo" is the twelfth episode of season 1. It is scheduled to air on January 30, 2013.

Synopsis
Oliver seeks the help of an old flame and Starling City's Vice cop, McKenna Hall, after his sister is caught by the police for using the drug called Vertigo. They look to track down its dealer, who goes by the name of "the Count". Meanwhile, Laurel stands up for Thea. Also, Felicity tells Ollie some disturbing news regarding his mother.

Production
Preparation ran from November 5 until November 14, 2012. Shooting ran from November 15 until November 26, 2012.