George Romeo recreated and redefined the Zombie genre with 1968’s “Night of the Living Dead,” a low-budget drive-in affair that serves as a horror landmark, spawning an entire genre’s worth of films. Since Romero’s first zombie film, the public has had a love affair with the undead, manifesting it in comedies and even romantic fare. To celebrate the 30th anniversary of Romero’s classic, we count down the 25 greatest zombie films, with a couple of surprises that only show just how ubiquitous the undead can be.