While apocalyptic tv shows like The Walking Dead and Z Nation are the vogue today, this show (remade in the 2000's) is absolutely terrifying because this could really happen. When a virus is accidentally released, it spreads world wide quickly and 90 percent of humanity is killed off. The survivors take one a few different ideas; banding together and attempting to recreate a civilization, becoming raiders on others, or simply dying off. A really brilliant and terrifying show.