31. Alien Invasion
We’re already involving things that would be possible but far-fetched, so why not bring up something that could actually cause a real zombie apocalypse? When it comes to aliens, we’re not just talking about the little green guys from space. Illegal aliens entering a nation could take people from their homes and force them to do things for them. Yet this version of an alien is not exactly the type everyone thinks about.
If we are talking those from space, consider that for a second. It is quite likely that if they made their way to the Earth from some random place across the universe, they likely have some killer technology. Their alien tech is something we’d likely have no answer for. If they chose to use something we have no idea how to fathom that turns people into zombies, well that could cause a huge issue. That said, it’s worth a mention.