It's like this.You're what they called a Personality Core. There's this thing... most of the facility calls it 'Her', if they can dare speak any name at all. Anyway, it's an AI. It's... homicidal. They made it by taking everything there was about the boss' assistant and cramming it into a machine. Against her will. And now the machine likes to kill people when it powers up. The scientists who made it felt that was a problem, and the way they tried to cure it was by sticking more personalities on her. Gave the inner ear too many voices to listen to.
They weren't particularly foresightful scientists, really. Or sane.
In your case, you're an ID. An Intelligence Dampener. The purpose of your little spherical existence is to generate a never-ending stream of bad ideas, none of which you recognize as such and all of which you're very proud of. And they stuck you on Her. It didn't go well, so they took you away.
There were deaths. A lot of them.
Time passed. You're not very good at telling how much of it there was.
And then there was a human. That pleased Her. She likes to test. Test to the point of breaking. To the point of death, actually, which was part of how some of the other humans died. You decided that if you helped this human, she could help you. Both would get away from Her. It... seemed like a really good idea. Especially the part where the human would plug you into the facility and take control away from Her.
That part worked. And as soon as it did, you wanted to test...
You kind of went mad there for a while.
In the end, the human and Her formed a very temporary truce to get you out of charge. You... weren't regulating the power source all that well: it was cooperate or be vaporized. The human got out. You were sent through the last portal. You think the human was trying to hang onto you before the vacuum sucked you in. You're not sure why.
That was four years ago. Four years of orbit. Four years to think about how the scientists designed the world's most perfect idiot. And you're it.
Four years to understand the concept of being sorry.
Four years before a meteor impact sent you hurtling back towards Earth. Back into the custody of Her, who is not particularly happy with you. Not at all.
http://tvtropes.org/pmwiki/pmwiki.php/Fanfic/BlueSky
Four years before the human came back for you.