GREY’S ANATOMY “Tainted Obligation” Season 6 Episode 3 October 7, 2009 Grey's Anatomy Watch a sneak peek of the GREY’S ANATOMY “Tainted Obligation” Season 6 Episode 3 airing Thursday October 8 at 9:00 p.m., ET. Episode Synopsis: GREY’S ANATOMY “Tainted Obligation” Season 6 Episode 3 – 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 “Grey’s Anatomy” stars Ellen Pompeo as Meredith Grey, Patrick Dempsey as Derek Shepherd, Sandra Oh as Cristina Yang, Katherine Heigl as Isobel “Izzie” Stevens, Justin Chambers as Alex Karev, Chandra Wilson as Miranda Bailey, James Pickens, Jr. as Richard Webber, Sara Ramirez as Callie Torres, Eric Dane as Mark Sloan, Chyler Leigh as Lexie Grey, Kevin McKidd as Owen Hunt and Jessica Capshaw as Arizona Robbins. 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. Read all our Grey’s Anatomy coverage. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Google+ (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Pocket (Opens in new window)