AS MARK, CALLIE AND ARIZONA'S BABY DRAMA CONTINUES, MEREDITH DISCOVERS HER EYESIGHT IS FAILING DUE TO HER FERTILITY TREATMENTS, ON ABC'S "GREY'S ANATOMY"

Loretta Devine ("Waiting to Exhale," "Boston Public") Guest Stars as Adele Webber

Peter MacNicol ("Ally McBeal") Returns as Dr. Stark; Nancy Travis ("So I Married An Axe Murderer") Also Guest Stars

Debbie Allen Directs

"Not Responsible" - Meredith must choose between her fertility treatments and her eyesight when she begins having trouble seeing, Mark makes it clear to Callie and Arizona that he takes his role as father-to-be very seriously, and April discovers there's more to Dr. Stark than first appears, on "Grey's Anatomy," THURSDAY, FEBRUARY 24 (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, 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.

Full guest cast TBA.

"Not Responsible" was written by Debora Cahn and directed by Debbie Allen.

"Grey's Anatomy" is broadcasted in 720 Progressive (720P), ABC's selected HTV format, with 5.1-channel surround sound. A TV parental guideline will be assigned closer to airdate.

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