UNITED STATES - FEBRUARY 13: 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 Walt Disney Television via Getty Images Television Network. (Photo by Ron Tom/Walt Disney Television via Getty Images)
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