GREY'S ANATOMY - "Before and After" - Addison, Naomi and Sam rush the ailing Archer to Seattle Grace and reunite with old friends Derek and Mark to help save his life; meanwhile, Izzie employs her fellow doctors in a medical game designed to help teach the interns, and Owen runs into a significant someone from his past, on "Grey's Anatomy," THURSDAY, FEBRUARY 12 (9:00-10:02 p.m., ET) on the ABC Television Network. (ABC/RICHARD CARTWRIGHT) KATE WALSH, PATRICK DEMPSEY