GREY'S ANATOMY - "Brave New World" - Cristina, Meredith and Izzie try to explain the appeal of Dermatology to George, on "Grey's Anatomy," THURSDAY, OCTOBER 16 (9:00-10:01 p.m., ET) on the ABC Television Network. (ABC/RANDY HOLMES) SANDRA OH, ELLEN POMPEO, KATHERINE HEIGL