A SCHOOLBUS CRASH FLOODS SEATTLE GRACE WITH TEENAGERS, DEREK GOES OUT ON A DATE WITH A FELLOW DOCTOR, AND MEREDITH SEE HER FATHER FOR THE FIRST TIME SINCE HER STEPMOTHER'S DEATH, ON ABC'S "GREY'S ANATOMY"

Jeff Perry Returns as Thatcher Grey, Kali Rocha Returns as Sydney Heron

"Forever Young" � The ER is filled with teenagers after a schoolbus crash, Bailey treats a patient who was her high school crush, Derek goes out on a date with a fellow doctor, and Thatcher enters the ER looking for Meredith, on "Grey's Anatomy," THURSDAY, JULY 24 (9:00-10:00 p.m., ET) on the ABC Television Network. (Rebroadcast. OAD 11/15/07)

"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, T.R. Knight as George O'Malley, 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, and Brooke Smith as Erica Hahn.

Guest Starring Jeff Perry as Thatcher, Kali Rocha as Sydney, D.B. Woodside as Marcus, Lauren Stamile as Rose, Madeline Zima as Marissa, Brooke Nevin as Tricia and Stephen Sowan as Danny.

"Forever Young" was written by Mark Wilding 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 audio via SAP. This program carries a TV-14,L parental guideline.

This episode of "Grey's Anatomy" will be available on ABC.com the day after airing on the network for users to watch online.