SEASON FINALE

MEREDITH AND DEREK WORK ON THEIR LAST PATIENT IN THEIR CLINICAL TRIAL, AS THE OTHER SURGEONS TRY DESPERATELY TO FREE A BOY FROM A HARDENING BLOCK OF CEMENT, ON THE TWO-HOUR SEASON FINALE OF ABC'S "GREY'S ANATOMY"

Amy Madigan ("Gone Baby Gone") Guest Stars

"Freedom" � On the two-hour season finale of "Grey's Anatomy," Meredith and Derek have one last shot at a successful outcome in their clinical trial, as the other surgeons work together to free a boy from a hardening block of cement. Meanwhile, Izzie helps Alex care for an ailing Rebecca, and Lexie discovers critical information about George's intern status, on "Grey's Anatomy," THURSDAY, MAY 22 (9:00-11:00 p.m., ET) on the ABC Television Network.

Editors note: This episode will repeat Friday, May 23 (8:00-10:00 p.m., ET).

"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 guest TBA.

"Freedom" was written by Shonda Rhimes 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. A TV parental guideline will be posted closer to airdate. (CC; Spanish subtitles via secondary CC).

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