GREY'S ANATOMY - "Stand By Me" - Izzie treats Mark Sloan's face transplant candidate, a patient that other SGH doctors have nicknamed "Blowhole," on "Grey's Anatomy," THURSDAY, MARCH 19 (9:00-10:02 p.m., ET) on the ABC Television Network. (ABC/CRAIG SJODIN) LARRY SULLIVAN, KATHERINE HEIGL