ABC
GREY'S ANATOMY Brooke Smith as Dr. Erica Hahn and Katherine Heigl as Dr. Isobel 'Izzie' Stevens star in the episode "Crash Into Me -- Part One" - An ambulance crash endangers the lives of the paramedics involved, as Meredith and the Chief work on-site to save them, Bailey treats a patient who refuses her help, and Ava returns for Alex and meets his other girlfriend in the process. Airs Thursday, November 22, 2007.
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