Grey's Anatomy · Season 5 · Episode 22

“What a Difference a Day Makes”

Aired Friday 8 May 2009 on ABC

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As Meredith, Derek 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 fears the worst when she begins experiencing familiar symptoms.

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