"Haunt You Every Day" Preview

"Haunt You Every Day" is the name of this week's episode. (October 25)
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.