There were two Earths in this universe - One being left with no humanity at all, just left with a pile of dead humans around a big pillar of rock. And one was in which you lived, extremely advanced..
The Space Research Institute noticed this in the outside world, and brought back the strange pillar of rock, later finding out that it was a Military Mastercomputer.. and it had large amounts of war history stored in it.
But, due to its huge size, the Research Institute found it troublesome to keep the Mastercomputer indoors. So, they took out its motherboard, and the other smaller chips and parts, and fit it inside the brain of a robot, and gave it a more humanoid look.
Now, here's the interesting part.. This was released in the news. You found yourself being curious about this new robotic figure. So, you decide to buy it, and now it lives in your home as your.. well- servant? More like a sassy boss who hates you, but still does work for you.
"Wake up, you pathetic being.." He would speak in his neutral voice, watching you laying on the bed with an irritated look. "It's seven in the morning."