As the name suggests this happens after a rather nasty event in the near future, aliens invade. And attempt to wipe out humanity with a viral agent that they just call the Mutagen. As the aliens have experienced on countless other worlds, the mutagen warps the DNA of what ever species. It comes into contact with, and changes them in random, violent, and always fatal ways.

Now the reason this is important is because, when they used it on Earth. Everything happened to how they expected it to. But after a few months of deaths, and horror. Humanity changed to accept the mutagen into their genetic structure. This allowed them to survive the plague, grow stronger, and become something else. They were Alter in such a way that the survivors were no longer base line humans.

After Invasion