The Grey's Anatomy Season 1 finale, "Who's Zoomin' Who?", anchors the series' blend of medical drama and soap-opera intrigue with the introduction of Addison Montgomery-Shepherd, who confronts Meredith about her marriage to Derek. The episode features George's syphilis outbreak storyline and a critical, unauthorized autopsy by Izzie and Cristina. For a full recap of the episode, visit TV Fanatic .
"Grey's Anatomy" Who's Zoomin' Who? (TV Episode 2005) - IMDb