GREY'S ANATOMY - "I Like You So Much Better When You're Naked" - After learning of Richard's drinking problem, Derek confronts him for the sake of his friend and the hospital, Izzie returns, hoping to reconcile with Alex, and tensions run high between Teddy, Cristina and Owen in the aftermath of Cristina's startling confession, on "Grey's Anatomy," THURSDAY, JANUARY 21 (9:00-10:01 p.m., ET) on the ABC Television Network. (ABC/SCOTT GARFIELD) CHANDRA WILSON