GREY'S ANATOMY - In the first hour of part two of the season finale of ABC's "Grey's Anatomy" -- "Deterioration of the Fight or Flight Response" -- Izzie and George attend to Denny as the pressure increases to find him a new heart, Cristina suddenly finds herself in charge of an ER, and Derek grapples with the realization that the life of a friend is in his hands. In the second hour, "Losing My Religion," Richard goes into interrogation mode about a patient's condition, Callie confronts George about his feelings for her, and Meredith and Derek meet about Doc. Part two of the season finale of "Grey's Anatomy" airs MONDAY, MAY 15 (9:00-11:00 p.m., ET) on the ABC Television Network. (ABC/SCOTT GARFIELD) JUSTIN CHAMBERS, JAMES PICKENS, JR.