EXAM DAY HAS ARRIVED FOR THE INTERNS -- AND NOT EVERYONE IS READY -- CALLIE'S SUSPICIONS OF GEORGE AND IZZIE GROW, AND CRISTINA STRUGGLES TO WRITE HER WEDDING VOWS, ON ABC'S "GREY'S ANATOMY"

Loretta Devine ("Crash") Guest Stars as Adele Webber

Elizabeth Reaser ("Sweet Land") Guest Stars as Ave/Jane Doe

"Testing 1-2-3" � The interns take the biggest test of their careers, their first-year medical exams, as the residents attend to three injured mountain climbers. Meanwhile Callie's suspicions of George and Izzie grow, and Cristina struggles to write her wedding vows, on "Grey's Anatomy," THURSDAY, MAY 10 (9:00-10:01 p.m., ET) on the ABC Television Network.

Editors note: This program will repeat Fri., May 11 (8:00-9:01 p.m., ET)

"Grey's Anatomy" stars Ellen Pompeo as Meredith Grey, Patrick Dempsey as Derek Shepherd, Sandra Oh as Cristina Yang, Isaiah Washington as Preston Burke, 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, Kate Walsh as Addison Shepherd, Sara Ramirez as Callie Torres and Eric Dane as Mark Sloan.

"Testing 1-2-3" was written by Allan Heinberg and directed by Christopher Misiano.

Guest starring are Loretta Devine as Adele Webber and Elizabeth Reaser as Ave/Jane Doe

"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.

A TV parental guideline will be posted closer to airdate.