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UNITED STATES - FEBRUARY 20: GREY'S ANATOMY - 'Scars and Souvenirs' - The race for chief heats up after a new competitor enters the fray, tensions escalate between Izzie and George, and Callie must reveal a big secret. Meanwhile, Derek treats a patient near and dear to him, while Alex continues his work with Jane Doe, on 'Grey's Anatomy,' THURSDAY, MARCH 15 (9:00-10:01 p.m., ET) on the ABC Television Network. (Photo by Ron Tom/ABC via Getty Images)

UNITED STATES - FEBRUARY 20:  GREY'S ANATOMY - 'Scars and Souvenirs' - The race for chief heats up after a new competitor enters the fray, tensions escalate between Izzie and George, and Callie must reveal a big secret. Meanwhile, Derek treats a patient near and dear to him, while Alex continues his work with Jane Doe, on 'Grey's Anatomy,' THURSDAY, MARCH 15 (9:00-10:01 p.m., ET) on the ABC Television Network.  (Photo by Ron Tom/ABC via Getty Images)