Ugh I hate that I have so much au ideas
Anyways, this AU is called "Inner Corruption". So yeah Earth's stress causes him to become a monster if he doesn't get help.
Proto-Earth is technically living in him and is trying to find a way to escape his inner consciousness and finally be free after billions of years trapped under his own mind controlled by someone else.
Other planets like Mars and Venus have their own Corruption demon (Aphrodite and Ares) but they'll corrupt them differently.
That's all for now :], I'll explain more if I can later but I have to go sleep-