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UNITED STATES - SEPTEMBER 07: GREY'S ANATOMY - 'Oh, The Guilt' - Bailey treats a young mother battling breast cancer, Derek learns more about Mark and Addison's relationship, the interns defend a resident's competence at a hospital staff meeting, and Meredith and Addison examine a couple who find themselves in a rather awkward position, on 'Grey's Anatomy,' THURSDAY, OCTOBER 19 (9:00-10:01 p.m., ET) on the ABC Television Network. (Photo by Richard Cartwright/ABC via Getty Images)

UNITED STATES - SEPTEMBER 07:  GREY'S ANATOMY - 'Oh, The Guilt' - Bailey treats a young mother battling breast cancer, Derek learns more about Mark and Addison's relationship, the interns defend a resident's competence at a hospital staff meeting, and Meredith and Addison examine a couple who find themselves in a rather awkward position, on 'Grey's Anatomy,' THURSDAY, OCTOBER 19 (9:00-10:01 p.m., ET) on the ABC Television Network.  (Photo by Richard Cartwright/ABC via Getty Images)