Grey's Anatomy: 5.04 "Brave New World" - Stills

GREY'S ANATOMY - "Brave New World" - Meredith freaks out when Derek discovers her mother's old diary in the house, Callie frets as she prepares for her first official date with Erica, and Cristina stumbles into a part of the hospital that neither she nor her fellow residents have seen before, on "Grey's Anatomy," THURSDAY, OCTOBER 16 (9:00-10:01 p.m., ET) on the ABC Television Network.