Production on Season 4 of The Walking Dead has been ongoing since May, when shooting started on the season premiere, "30 Days Without an Accident". Today we have a featurette from the set of that first episode, featuring cast members Andrew Lincoln, Steven Yeun, Norman Reedus, executive producer Robert Kirkman, and many more discuss how the energy on the set is higher than it's ever been, the scripts are much darker, and, of course, that there will be more zombies for Rick and his group to contend with. Go behind-the-scenes with the cast and crew of this hit AMC series before it returns on Sunday, October 13 with the Season 4 premiere.