Dizi Adı: Grey's Anatomy
Bölüm Adı: Tainted Obligation
Sezon/Bölüm: 6. Sezon 4. Bölüm
Yayın Tarihi: 8 Eki. 2009

When Meredith and Lexie’s father, Thatcher, returns to the hospital with a failed liver, it’s up to Meredith to save his life. Meanwhile, Izzie empathizes with a patient riddled with tumors, as Mark, annoyed with Cristina’s competitive zeal, tricks her into assisting on an unusual surgery.