A flexible metaphor for all manner of social, cultural and political maladies, the zombie genre has, over the decades, been employed as an analogue for everything from the U.S. occupation of Haiti (1932’s Bela Lugosi starrer “White Zombie”) to the upheaval of the Vietnam/civil rights era (“Night of the Living Dead”) and the bio-panics of the late 20th century (“28 Days Later,” “Resident Evil”).