What is the apocalypse according to The Walking Dead? The Walking Dead plays off the usual tropes of the zombie and horror genre. The dead are re-animated through a disease or plague of unknown origin. In 28 Days Later (2002), a zombie plague is unleashed through a virus transmitted from lab animals to humans. 28 Days Later gives us an apocalyptic image that is utterly accidental. The outbreak or plague is never planned for, but it is the accident or catastrophe of modern science or civilization. In the case of the zombie outbreak, it is an accident of science reaching too far.