RICHARD, BAILEY AND CALLIE FLASHBACK TO KEY SURGICAL CASES FROM THEIR PASTS WHEN THEY EACH PRESENT AT CHIEF DEREK'S NEW LECTURE SERIES, ON ABC'S "GREY'S ANATOMY"

Guest Starring Sarah Paulson ("Down with Love") and J. August Richards ("Raising the Bar," "Angel") as Young Ellis Grey and Young Richard Webber

Guest Starring Missi Pyle ("Charlie and the Chocolate Factory") as Bailey's Former Nemesis, Dr. Nicole Baylow

"The Time Warp" - In his new role as Chief, Derek restores the hospital lecture series, and Richard, Bailey and Callie present to the group pivotal surgical cases from their pasts - Bailey reflects on her first days as a shy resident, Callie looks back on a polio case, and Richard recalls a case in which he and Ellis worked on a patient diagnosed with GRID, a virus later called AIDS -- on "Grey's Anatomy," THURSDAY, MAY 27 (10:00-11:00p.m., ET) on the ABC Television Network. (Rebroadcast: OAD: 2/18/10)

"Grey's Anatomy" stars 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 and Jessica Capshaw as Arizona Robbins.

Guest stars include Sarah Paulson as Young Ellis, J. August Richards Grey as Young Richard Webber and Missi Pyle as Dr. Nicole Baylow

"The Time Warp" was written by Zoanne Clack and directed by Rob Corn.

"Grey's Anatomy" is broadcast in 720 Progressive (720P), ABC's selected HDTV format, with 5.1-channel surround sound and Spanish subtitles via secondary closed captioning. This program carries a TV-14 parental guideline.

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