A little over forty years ago, George A. Romero changed the nature of zombies with his low-budget breakthrough film, Night of the Living Dead. Since then zombies, combining visceral horror and social commentary, have shambled into the mainstream. We've had zombie horrors, zombie comedies, and zombie graphic novels. Zombie walks have become regular events in many communities, and AMC runs a prestige zombie television show. Why are zombies so popular? Have we reached a saturation point? Will zombies ever shuffle off their immortal coil?