The results of the first-year exams are posted, and all but one the interns have passed. Cristina (Sandra Oh) and Burke (Isaiah Washington) are ready to march down the aisle and exchange vows--or are they? An important decision reached by George (T.R. Knight) and Callie (Sara Ramirez) is clouded by thoughts of Izzie (Katherine Heigl). Alex (Justin Chambers) has trouble hiding his feelings when the husband of Rebecca Pope--aka Ava, aka Jane Doe--shows up. It's anybody's guess where things stand for Meredith (Ellen Pompeo) and Derek (Patrick Dempsey) And as his wife (Loretta Devine) undergoes surgery, Dr. Webber (James Pickens Jr.) announces the name of his successor. This cliffhanger finale of Grey's Anatomy's third season marks the final series appearance of Kate Walsh (Addison), who will headline the spinoff series Private Practice. ~ Hal Erickson, Rovi