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Overall Rating: 4.63/5 (7103 votes cast)

Season 6, Episode 4 - "Tainted Obligation"

8 October, 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.

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