GREY'S ANATOMY - "Dream a Little Dream of Me" - Derek takes issue with some of the Army medic Owen Hunt's methods, but he can't argue with the results, on "Grey's Anatomy," THURSDAY, SEPTEMBER 25 (9:00-11:00 p.m., ET) on the ABC Television Network. (ABC/SCOTT GARFIELD) SARA RAMIREZ, PATRICK DEMPSEY, SANDRA OH, KEVIN McKIDD