Grey's Anatomy Season 6 Episode 4
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.
Guest Stars
Jeff Perry
Thatcher Grey
Mark Saul
Steve
Tom Amandes
Tom Waller
Isabella Hofmann
Irene Waller
Phil Abrams
Dr. Nelson