Dizi Adı: Grey's Anatomy
Bölüm Adı: What a Difference a Day Makes
Sezon/Bölüm: 5. Sezon 22. Bölüm
Yayın Tarihi: 7 May. 2009

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.