4x07 Physical Attraction... Chemical Reaction
First Aired: Nov. 08, 2007 on ABC
Summary: George and Izzie's relationship is tested, as is Derek and Meredith's when Derek wants more than a physical relationship with her. Meanwhile, Mark falls for a surgeon and Callie's position as Chief Resident is put on the line when she gives too many duties to Bailey.
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Guest Stars[no credits found]