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