Production on Season 4 of The Walking Dead is currently under way in Atlanta, with the latest featurette taking us behind-the-scenes on the set. Executive producers Gale Anne Hurd and Robert Kirkman tell an amusing story about how Greg Nicotero learned he was set to direct the Season 4 Premiere. They also tease that an action scene in the premiere is the biggest they have ever done on this hit AMC zombie series. Since it will likely be several months before we see any footage, this featurette should whet your appetite for the undead mayhem coming later this fall.