ABC
GREY'S ANATOMY Katherine Heigl as Dr. Isobel 'Izzie' Stevens and T.R. Knight as Dr. George O'Malley star in the episode "Haunt You Every Day" - It's Halloween, and the day is full of surprises for the doctors of Seattle Grace - Alex receives an unexpected and welcome visit from his former patient, Ava/Rebecca, Meredith is convinced that her mother's ashes are haunting her, Cristina is snubbed by a surgeon she admires, and Callie announces George and Izzie's affair to their fellow doctors. Airs Thursday, October 25, 2007.
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