What a Difference a Day Makes Grey's Anatomy : Season 5 Episode 22
TV-14 ABC 41m
Aired: May 7th, 2009 @ 9:00 PM EST on ABC
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.
