As AMC sews up the first season of the apocalyptic zombie hit The Walking Dead, the survivors begin to turn on one another. "Before it's all said and done, the opinions and actions of the group are divided," according to executive producer/director Frank Darabont. "Stakes are higher, dissension develops, rivalries intensify," adds executive producer Gale Ann Hurd, so expect the last two episodes to include shifting allegiances and emotional betrayals. After an attack on the camp, Rick Grimes (Andrew Lincoln) and the remaining refugees seek new shelter. And Darabont reasons, "If I'm in some biological holocaust and I'm in Atlanta, wouldn't the Centers for Disease Control be the first place to go?" Enter the mysterious Dr. Jenner (Noah Emmerich), who Hurd says, "has his own unique perspective on the crisis."