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UNITED STATES - MARCH 23: GREY'S ANATOMY - 'Desire' - As the interns of Seattle Grace cram for their upcoming exam, the attendings vie for the Chief's position by tending to the chairman of the hospital board after he's admitted as a patient. Meanwhile, Burke struggles to involve Cristina in the wedding planning, things heat up between Addison and Alex, and Derek questions his relationship with Meredith, on 'Grey's Anatomy,' THURSDAY, APRIL 26 (9:00-10:01 p.m., ET) on the ABC Television Network. (Photo by Gale Adler/ABC via Getty Images)

UNITED STATES - MARCH 23:  GREY'S ANATOMY - 'Desire' - As the interns of Seattle Grace cram for their upcoming exam, the attendings vie for the Chief's position by tending to the chairman of the hospital board after he's admitted as a patient. Meanwhile, Burke struggles to involve Cristina in the wedding planning, things heat up between Addison and Alex, and Derek questions his relationship with Meredith, on 'Grey's Anatomy,' THURSDAY, APRIL 26 (9:00-10:01 p.m., ET) on the ABC Television Network.  (Photo by Gale Adler/ABC via Getty Images)