GREY'S ANATOMY - "In The Midnight Hour" - Meredith, Cristina and Bailey come to Lexie and Sadie's rescue when a routine surgery goes horribly wrong, on "Grey's Anatomy," THURSDAY, NOVEMBER 20 (9:00-10:01 p.m., ET) on the ABC Television Network. (ABC/RON TOM) ELLEN POMPEO, SANDRA OH, CHYLER LEIGH