 General surgeon and Chief Resident Dr. Miranda Bailey was portrayed by Chandra Wilson, while general surgeon and Chief of Surgery Dr. Richard Webber was played by James Pickens, Jr. Sara Ramirez portrayed orthopedic surgeon Dr. Calliope "Callie" Torres whose storylines during the season revolve around her recently discovered bisexuality.Eric Dane's character, plastic surgeon Dr. Mark Sloan, begins a relationship with intern Dr. Lexie Grey, Meredith's half-sister portrayed by Chyler Leigh.Brooke Smith appeared in seven episodes as cardiothoracic surgeon Dr. Erica Hahn, Callie's love interest, who eventually resigns and moves away.