Tainted Obligation
Season 6, episode 4 of Grey's Anatomy (2005) · 2009-10-08
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Episode Summary
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.