Following Derek's success, Mark is inspired to form his own clinical trial. Izzie continues to see visions of Denny and Alex sees her struggling. Addison Montgomery in one episode. Water leaks appear in the ceiling throughout the hospital's surgical floor but Webber is reluctant to remove any patients until ceiling tiles in an OR collapse onto a patient during a surgery. A blast from the past throws Maggie off her game on the same day that Meredith tries to talk to her about dating Deluca.
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