In the Bible, the four figures who usher in the end of the world, representing pestilence, famine, war, and death. It's so dark out here with this storm looming that I'm waiting for the Four Horsemen of the Apocalypse to show up!

A scenario depicted in apocalyptic fiction in which an onslaught of zombies (undead corpses) causes the collapse of human civilization. The Walking Dead and other shows and movies about a zombie apocalypse have proven wildly popular.