Well, it's a post-apocalyptic setting, anyway. I tend to find the actual initial war / outbreak ridiculous. I might call bullshit on my own plot if it wasn't a deliberately "fantasy" filled setting and I didn't include a witch with god-like powers backing the undead (and immortal) hordes / cranking out more of them on a constant basis in the beginning. (Which, incidentally, is why I made a point of the "somebody tried to nuke them" entry in the journal.)