“Grey’s Anatomy” (9 p.m., ABC): “Grey’s Anatomy” launches its

“Grey’s Anatomy” (9 p.m., ABC): “Grey’s Anatomy” launches its sixth season with a two-hour downer as the staff at Seattle Grace copes with the death of George. Meanwhile, his mother (Debra Monk) struggles over what to do with his organs. “Grey’s” airs just after the debut of the eerie new thriller “FlashForward.”