The mid-season finale of the sixth season of AMC's "The Walking Dead" airs this weekend, but ahead of that broadcast two of the show's stars are promising some seriously dark and intense storytelling for the remaining eight episodes early next year. Norman Reedus tells Variety that the momentum that has been building up so far will come to a head and explode: "I want to say that our back half is the best 8 we've ever done.