Such disruptive comings and goings in season 5! Although Sandra Oh is still terrific fun as Cristina, the show feels as if it were suffering the muddling onset of flu. Brooke Smith, a formidable actress, was clumsily dropped after her character, Dr. Hahn, embarked on an unconvincing love affair with Callie (Sara Ramirez). Kevin McKidd, a fine actor with a laser-like glare, has joined the cast as a macho trauma expert, but so far his Dr. Hunt is hard to fathom—one episode had him stabbing pigs as if he were Rambo. Then there was a recent visit from dead Denny (Jeffrey Dean Morgan). Please, no more Denny! He always looks like a giant panda in need of a hug. And Melissa George has just shown up as an intern—don't be surprised if she unleashes dramatic storms, as she did on HBO's In Treatment. Maybe this is all preventive medicine to keep a long-running show a healthy hit. We'll see.