ABC
GREY'S ANATOMY T.R. Knight as Dr. George O'Malley and Katherine Heigl as Dr. Isobel 'Izzie' Stevens star in the episode "The Heart of the Matter" - The Chief's wife, Adele, rushes their niece to Seattle Grace, the hospital where she once had her prom, Izzie reveals her feelings for George to a mutual friend, and the reaction is not what she expects, Derek teaches Cristina how to be a better teaching resident, and the world's oldest living intern, Norman, misdiagnoses one of Meredith's patients. Airs Thursday, October 18, 2007.
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