GREY'S ANATOMY - &quot;Scars and Souvenirs&quot; - 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 &quot;Grey's Anatomy,&quot; THURSDAY, MARCH 15 (9:00-10:01 p.m., ET) on the ABC Television Network. (ABC/RON TOM)SARA RAMIREZ
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