Genetically perfect humans on Earth create Artificial Intelligence. Which promptly takes over the planet. AIs declare war on Martian humans. Martian humans, with backward technology and dauntless courage, destroy the AIs. Martian humans attack Earth's perfect humans.
Humans take over Earth.
I'm sure I'm wrong. Dates in Calendar are closer than they appear. I made a fortune out of it. There are nights when the wolves are silent and only the moon howls. When speaking, especially in the workplace, one should be careful to avoid displacing blame.