• Season 6 Episode 4
  • Tainted Obligation

  • Airdate:08.10.2009.

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 

series regulars:

    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
    Jessica Capshaw as Arizona Robbins.

guest cast:

    Jeff Perry as Thatcher Grey
    Ralph Waite as Irving Waller
    Tom Amandes as Charlie Walle
    Isabella Hofmann as Irene Waller
    Jocko Sims as Randy
    Kristen Ariza as Angela,

written by:

Jenna Bans

directed by:

Tom Verica