GEORGE O'MALLEY'S MOM RETURNS TO SEATTLE GRACE FOR SURGERY, SPARKING MEMORIES OF PAST LOVES AND FRIENDSHIPS, ON ABC'S "GREY'S ANATOMY"

Debra Monk Reprises Her Role as Louise O'Malley

Alfre Woodard ("True Blood") and Scott Foley ("Felicity," "Scream 3") Guest Star

"Heart-Shaped Box" - The doctors become nostalgic when George O'Malley's mother, Louise, returns to Seattle Grace for medical help after a botched surgery at a neighboring hospital; the residents are inspired by a medical miracle when they witness a harvested heart that continues to beat outside the body; a new pediatric fellow excites Arizona and makes Alex feel threatened; Jackson lets his suspicions about Mark and Lexie interfere with his work; and Henry and Teddy have their first marital fight when he expresses interest in pursuing medical school, on Grey's Anatomy, THURSDAY, DECEMBER 29 (9:00-10:00 p.m., ET) on the ABC Television Network. (Rebroadcast. OAD 11/3/11)

"Grey's Anatomy" stars Ellen Pompeo as Meredith Grey, Patrick Dempsey as Derek Shepherd, Sandra Oh as Cristina Yang, 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, Kim Raver as Teddy Altman, Jesse Williams as Jackson Avery and Sarah Drew as April Kepner.

Guest cast includes Debra Monk as Mrs. O'Malley, Vedette Lim as Polly, Scott Foley as Henry Burton and Alfre Woodard as Justine.

"Heart-Shaped Box" was written by Austin Guzman and directed by Jessica Yu.

"Grey's Anatomy" is broadcasted in 720 Progressive (720P), ABC's selected HTV format, with 5.1-channel surround sound. This program carries a TV-14,S parental guideline.

For more information on "Grey's Anatomy" please visit ABC.com.