Welcome to the story.
Chapter 1
The Labs
GLaDOS was bored. She had nothing to do since all the test subjects have died in one way or another, aside from one, who managed to get the best of her, twice. Although she wasn't programmed this way, she secretly enjoyed it when a test subject failed miserably. But it would be one less test subject. The one that survived through all the tests, she let go. Atlas and P-body, two robot testers, helped her find a storage of test subjects, but those are all dead, and the two robots were deactivated. She could reactivate them. No. What will they do, with all those human traits they've developed? She decided to update the Aperture Science Handheld Portal Device so that it can be more efficient. As she brought the portal gun in and started working on it, humming still alive, the gun somehow shot both portals at the same time and the energy hit one of the white walls in the room, yet no portal was was formed there. What actually happened was that one portal got to an unknown location in the labs, and the other ended up in another dimension. GLaDOS just continued working on updating the portal gun.
Meanwhile, in space, right over the labs, Wheatley and the space core were drifting straight towards Earth, speeding up as they got closer to the planet. Wheatley, noticing this, said "Hey, space? It seems like your visit is going to be cut a little short."
"Noooooo!" screamed the space core, "More space!"
"Sorry, I'm not in control of what's happening." Wheatley said, as they entered Earth's atmosphere and plummeted straight down towards Aperture.
In the labs, GLaDOS was putting the finishing touches on the newly updated portal gun when a crash sounded through the labs. Although she wasn't startled, the sudden sound did annoy her. Irritated, she checked the cameras for the source. An AI with her intellect does not get surprised easily, but what she saw did, if only for a moment. Wheatley and the space core were back, and mostly intact. One thing that did not surprise her was that the two cores weren't working. Two mechanical arms, under the control of GLaDOS, grabbed the two cores and took them to GLaDOS's room. She decided to activate nanobots to fix them She then finished the updates to the portal gun. And then again, what to do? Oh yeah. she can work on her secret project she had started.
A/N: Yes, it's short, but what the hay. Mini chapters!