Here is an uncontested truth: Our 24/7 zombie entertainment culture owes George A. Romero everything. Ev. Ery. Thing. Without him -- without the eruption from the cinematic id called "Night of the Living Dead" in 1968, there would be no "The Walking Dead" on cable TV and no "World War Z" book or movie. There'd be no "Resident Evil" or a zillion other videogames, no cross-genre mash-ups like "Pride and Prejudice and Zombies" on the bookshelves and zombie-human romances like "Warm Bodies" in movie theaters. No meta-undead comedies like "Zombieland," with its riffing on the rules of zombie behavior that "Night of the Living Dead" established.