Matt was reborn at the beginning of the Apocalypse.
This world had been invaded by the aliens and turned into a wasteland. The aliens had polluted water and blocked sunshine, but they had unexpectedly opened the evolutionary chain of creatures. The surviving humans had become at the bottom of the food chain, facing all kinds of fatal crises.
Matt used his Evolution System to absorb the energy from aliens, letting everything could freely evolve.
A little tree could evolve into the world tree and become the refuge for human beings to live with.
A little rat could evolve into a giant rat and carry the heavyweight of humans to move forward.
A little snake could evolve into a python bigger to protect the tinder of human civilization.
When the world fell into darkness, I would create a world by myself; when the lighthouse of technology perished, I would be completely evolved; when human civilization was about to be extinct, I would definitely fight to the end.