DISCLAIMER: I don't own anything Doctor Who related. Well, maybe two books, but that's it. From this story I only own the idea (at least I hope I do) and my OC.

A/N1: Firstly, I have to say I haven't finished this story. So the rating may go up. Secondly, yes, this will contain femslash. If this is nothing you'd like to read, there is still time to read another story. Flamers will be used for a barbecue. Thirdly, I really don't know how I got this idea, all I know it was probably very late and I was probably very tired. So please be kind with the idea. No one is forcing you to read the story.

A/N2: Each chapter in this story is based on another song. The song provides the title of the chapter and will be given above each chapter alongside a short, representing excerpt. The Whole story is also represented by a song. It's 'Our Love' by Rhett Miller.
I try to be as canon compliant as possible. But I can gurantee that it will be 100% compliant.

SPOILERS: Doctor Who: Season 6, Episode 8 - Let's Kill Hitler / The Sarah Jane Adventures: Season 4, Episode 8 - The Empty Planet / Torchwood: Season 2, Episode 13 - Exit Wounds = I'll disregard that Tosh and Owen died, well, really died. / The Spoilers also represent the level of information I'll use in this story. Every scrap of information up until these episodes will be used.

DEDICATION: I'd like to dedicate this to 'The TV-Junkie' who has helped this story out of the closet. It was a bit scared of the wide world. Has anyone ever told you that you're absolutely brilliant? If not: You're absolutely brilliant. Thank you.

A/N3: Seeing as English is not my mother tongue, I'd like to apologize in advance for any mistakes I might've overlooked. Constructive criticism is always welcome.

Chapter 1 - Golden

And I saw God cry in the reflection of my enemies
And all the lovers with no time for me
And all of the mothers raised their babies
To stay away from me
And pray they don't grow up to be me
- Golden - Fall Out Boy -

What she was about to do could be considered suicidal, if it weren't for the exceptional skills she had. And still, it was a risk. A huge risk. But she had a plan. A good plan. Granted, the plan wasn't that good considering it wasn't even finished yet. But she was already on her way to her destination. She'd just have wing it, like she usually did.

So, the first part of her 'plan' had worked out. She sat on board a spaceship which would bring her near the orbit. All that was necessary to convince the pilot to do that was a big enough amount of money. Admittedly, she didn't have the money, but hoped that her bluff would hold until they had arrived at their destination.

Now, all she had to do was waiting. Looking out of the window was out of question, because the ship didn't possess any windows and anyway what would she be looking at? Dark space? A couple of stars in the distance, all of which she had already seen a lot of times? So, she sat in her seat and allowed her thoughts to wander.

She was about to do something highly illegal. But that didn't really bother her. She had done illegal things before, or at least things that were bending the intergalactic laws.

She had the power to do so. She always had the dark side in her. But she had learned to tame it and now used it to do good things. But every once in a while she had to do something illegal, if she wanted to or not. Right now was one of the times she didn't want to do it but had to anyway.

She had been abducted by some alien race when she had been three years old. They had brought her to their planet, which was on the other side of the galaxy. So her parents couldn't get to her. Well, her mother and grandparents couldn't get to her.

She had been raised by these people who, even by her standards, were evil. They had taught her how to infiltrate any facility or society, how to move undetected and the ways of killing. They had tried to set her onto an enemy of theirs. But the only problem was she wasn't in the right universe to carry out her 'mission'.

So they had searched for a way to send her to the right universe. Meanwhile they had trained her to be a merciless, fearless assassin without regrets. They had sent her out into the universe and had let her eliminate some targets. Usually some scumbags who had caused the people to suffer. But sometimes she had had to neutralize a target which wasn't a scumbag, but a good person. The decision to do what was right and what was easy, was never easy.

Whilst she traveled the universe, she had come across many different races. And she usually had tried to get some information from a person, if she had found out that that person had been to Earth recently. That's how she had found out that her kidnappers had obviously taken her at a time when her mother couldn't be found anywhere. And her grandparents had been occupied otherwise and hadn't been able protect her entirely.

She had only been able to resist her kidnappers and seem as if she hadn't been resisting them at all, because she was different than them. Even different than her parents. Well, judging from the web of lies her captors had given her. They told her that she had been given to them by her parents. She knew better and over the years she had found out why.

At first she had thought she'd go insane, because she was hearing a voice in her head. A quiet, yet very powerful voice. This voice had told her who she really was and had showed her memories from her father and some from her mother at night in her dreams. This powerful voice had made her go on, because it seemed to know what was going to happen. And it had filled her with hope that she would find her parents again. But the voice never disclosed who or what it was.

In the end, her kidnappers had found a way to send her to the other universe. It had been through a tiny blip between the universes. They couldn't hold it open for very long. And after they would have sent her through, it would close off and they would never have any mean to contact her. It hadn't been the best choice for them, but they took it anyway. And that had been how she ended up in a universe where she hadn't known anyone, without money or a place to stay.

Luckily she had come out on Earth, not so lucky she had come out in a very tall, disused building in the middle of London. And very soon she had learned what that room, in which she had landed, had for significance.

She had not taken five steps into the room when she was attacked by a wave of visions. Two more steps and another wave made its way into her head. It was horrifying what she saw. Until then she had known about it, from her dreams at night, but now it had given her the pure emotions of the situations. The terror, the despair, the suffering.

She had just wanted to get out of there. To run, where hadn't mattered at the moment. But she hadn't got very far. She hadn't been far from the door when it had sprung open and a woman had burst into the room, closely followed by two teenagers. The appearance of the woman had let another wave of vision loose. This time there had been happy and sad ones. And the visions had provided her with a name.

Sarah Jane Smith.

She then had known that she could trust the woman. And then it had been as if someone had whacked her over the head, because she had fallen unconscious on the spot. When she had woken up again, she had lain on some sofa in what had seemed to be an attic with some sort of big computer on the other side of the room. Sarah Jane and the teenagers had stood in front of it and had been talking to it, no, with it. She had got up and had tried to walk over to them but had been prevented by walking more than two steps away from the sofa by some force field. That had alerted the others and they had turned towards her.

Sarah Jane had bombarded her with questions. It had been exactly like she had seen Sarah Jane in her visions. So she had answered the questions as best as she could and had hoped that she wouldn't be thrown to the lions. Figuratively speaking. But Sarah Jane had seemed satisfied with her answers.

And soon they had settled an agreement and from then on she had some kind of a home. She had started to help Sarah Jane and the teenagers, Rani and Clyde, as she had learned soon after. Luke, Sarah Jane's son, had been at university but they had met as soon as he had come home for the holidays. It had been shortly before Christmas and as they had informed her that was the time in which the possibility of an alien invasion was very much higher than on all the other times of the year.

Well, that had been times. She still had visions about certain things and the voice was still talking to her and she still didn't know who or what it was and she still lived at Sarah Jane's but had to be careful because she didn't want to mess up the time lines too much. Because the voice had informed her that she hadn't just traversed the boundaries of the universes but also traveled through time, because time was running differently in the two universes. And that was also the reason for her being on this stupid 'suicide mission'. All to prevent the time lines from being messed up.

She sighed as the pilot announced that they'd be arriving at their destination in approximately two minutes.

It was time to get ready. She geared up and checked every piece of her equipment twice. She never carried a gun but that wasn't important. She didn't need a gun, she was the weapon. She took a last deep breath before she had to teleport onto the surface.

They arrived at their destination just in time because the pilot then got the message that her payment wasn't transferred. He turned around and grabbed his gun.

"I think your journey ends here. Your cash hasn't been transferred."

She turned around calmly.

"Oops." And then she put on a mischievous grin. "You should always remember: Never trust a shadow."

And with that she teleported herself onto the surface of the planet beneath. There was work to be done.

After all, she was breaking into the Stormcage Containment Facility. And that was said to be impossible.

But she didn't care about impossible. As she always said: Impossible is just two letters away from possible.

It was night and she had to grin as she silently crept behind a rock because she just remembered after what she had chosen her name. She was like a shadow. And that was her name.

Shadow.