Guest Starring Jeff Perry as Thatcher Grey.
"Tainted Obligation" - 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, on "Grey's Anatomy," THURSDAY, OCTOBER 8 (9:00-10:01 p.m., ET) on the ABC Television Network
Guest starring Jeff Perry as Thatcher Grey, Ralph Waite as Irving Waller, Tom Amandes as Charlie Waller, Isabella Hofmann as Irene Waller, Jocko Sims as Randy and Kristen Ariza as Angela,
"Tainted Obligation" was written by Jenna Bans and directed by Tom Verica. source
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