Grey's Anatomy's 100th Episode: What a Difference a Day Makes

Thursday, May 7 9 p.m.

As Meredith (Ellen Pompeo), Derek (Patrick Dempsey) and all of their friends prepare for the big wedding, a group of college students, injured in a car crash as they were heading to their graduation ceremony, is admitted to the ER. Meanwhile, Izzie (Katherine Heigl) fears the worst when she begins experiencing familiar symptoms.

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