IN AN EPISODE THAT SHOWS SEATTLE GRACE AS IT NEVER WAS -- BUT COULD HAVE BEEN -- MEREDITH WONDERS,"WHAT IF..." ON ABC'S "GREY'S ANATOMY"

Kate Walsh ( "Private Practice") and Kate Burton (Emmy(R) Nominee For her Role as Ellis Grey) Return

"If/Then" - As Meredith puts Zola to bed and falls asleep, she begins to wonder -- what if her mother had never had Alzheimer's and she'd had loving, supportive parents? The reverberations of a happy Meredith Grey change the world of Seattle Grace as we know it. What if she had never met Derek in that bar and he had never separated from Addison? What if Callie and Owen had become a couple long before she met Arizona? And what if Bailey never evolved from the meek intern she once was? "Grey's Anatomy" airs THURSDAY, FEBRUARY 2 (9:00-10:02 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.

Guest cast TBA.

"If/Then" was written by William Harper and directed by Jeannot Szwarc.

"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 parental guideline.

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