GREY'S ANATOMY - "Here Comes the Flood" - Alex and Izzie beg to be able to stay with Meredith and Derek, but Derek wants them out, on "Grey's Anatomy," THURSDAY, OCTOBER 9 (9:00-10:01 p.m., ET) on the ABC Television Network. (ABC/DANNY FELD) JUSTIN CHAMBERS, ELLEN POMPEO, KATHERINE HEIGL, PATRICK DEMPSEY