Grey's Anatomy · Season 6 · Episode 4

“Tainted Obligation”

Aired Friday 9 October 2009 on ABC

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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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