Hey! I've wanted to do this for a while, so here it is! A Darren Shan saga and Doctor Who crossover! It's set around book eight in the Darren Shan series, and just...somewhere in Doctor Who. Obviously it's when Rose was the companion (and yes, it's the tenth Doctor-who else?) Now, the plot idea I got from Doomsday with...well, you'll see! And if it seems a bit random at first, everything will become clear later.

Disclaimer: I don't own Doctor Who, The DSS/CDF series, or Back to the Future.

*This story is dedicated to timeandcirque, because she loves Doctor Who and DSS as well, and it's great to have someone to talk to about it! Check out her crossover 'Destiny of the Doctor'!*

So without further ado, it's chapter one!

"Can I ask you something?" Rose asked casually as she flipped a switch on the TARDIS console.

"Technically, you just did anyway," the Doctor replied, grinning. "But you can ask something else if you want."

"Smart ass," she muttered, and he smirked. "Anyway, I was wondering…do you know what's going to happen? You know, in the future?" She looked at him curiously for an answer, and he frowned.

"I know a few things," he said slowly. "Most I discover by accident. I never deliberately look for the future, in case I find something out I don't want to, or ruin the surprise…" he looked at her suspiciously. "Why?"

"No reason, exactly-"

"I have had COUNTLESS people come to me and ask me how they die and if I can save them, or people asking me if they'll ever get married, if they'll ever have kids-"

"Doctor-"

"…how does the universe end, who killed Archie Mitchell-"

"Doctor, I-who did kill Archie Mitchell?"

"Stacey. Anyway, the point is, whatever you want to know, the answer is absolutely NO with a capital 'N'. And an exclamation mark!" He pinged a bell on the console for extra emphasis and glared at her sternly. "Understood?"

"Yes," she said stiffly, and looked down. "There's no need to get so snappy." He raised his eyebrows.

"Oh really? Remember that time I took you back to see your father? And when you saw the world end, I know for a fact that if there was a massive red button with a sign saying 'Will stop the Earth ending regardless of any terrible consequences', you would have pressed it!"

"I've learnt my lesson!" she said, looking hurt. "And as if there'd be a button for that."

"It was just an example to make things easier for your human brain! Fine, I'll show you a more complicated scenario and illustrate the exact chain of how every little thing changed can affect something else on a much bigger scale!" he said. "With destructive and terrible consequences coming from what at first seemed to be a mild and harmless amount of interference!"

"Go on then!" Rose snapped, exasperated. "I'm sure I can keep up!"

"Fine!" he said, and pulled a box out from under the floor panels. "But first you'll need a DVD player," he said, chucking a box set at her. She looked at it and sighed, then held it up.

"This is 'Back to the Future'."

"I know. Cracking film."

"Look, the only reason I wanted to know if you could see the future was because I was wondering if it ever got boring. Knowing exactly what was going to happen."

"I don't know what's going to happen. Things can change sometimes, and I try not to spoil it for myself most of the time," he replied. Then he frowned. "But sometimes…the TARDIS picks up on certain points in time. They're normal totally unimportant-or seem to be-but there's an odd flux of some sort. And that event then leads to another massive point."

"But that's just how it works," Rose said, but she sounded uncertain. "Isn't it?"

"Yes," he agreed, then leant across the console and said darkly. "But the TARDIS always picks up on something. Sometimes…it's not natural. Like someone's manipulating space and time." Rose's eyes flickered with worry, then the Doctor straightened up again.

"Right!" he said, his usual cheerful self again. "Where to next? The planet Flob? I went there once. Weird place, inhabited by these strange creatures that look like they're made of jelly. You don't want to make the mistake of biting one, though, they take offence-"

Suddenly, a loud, wailing alarm went off and red lights flashed in the TARDIS, causing the Doctor's face to collapse with worry and run to the console.

"What is it?" Rose shouted over the alarms, as the Doctor pulled around a screen. He frowned.

"What?" he yelped. "WHAT?"

"What?"

"It's my Earth monitor!"

"Earth monitor?"

"Well, yeah! You're so rubbish at defending yourselves that I have to watch it all the time. Anyway, this is just…impossible!"

"What is?"

"There's an invasion! Not just one but…lots of species. Silurians, Sontarans, Cybermen, Flobbers from the planet Flob-although I doubt they'll do much-and…" he trailed off and looked at Rose. "Daleks."

"But why?" Rose asked in horror. "What do they want with Earth?"

"I don't know," he said, then froze as the screen flickered and the sound of alien voices flooded the speakers. "I've got signals from their ships…hang on, let's find one that's easy to understand…" he pressed a few buttons and Rose heard a wibbly sounding voice that she guessed was from a Flobber and the monotone voice of a Dalek before the Doctor settled on one. "Let's hear what the Sontarans have to say."

"We go into battle for the glory of Sontar!" said the voice the Doctor had picked up from the Sontaran ship. "We fight for honour! For victory! To show our enemies that Sontarans are always victorious! Sontar-"

"That's quite enough of that," the Doctor said, flicking a switch. "They could go on for hours…let's try the Cybermen." A shudder passed down Rose's spine as the mechanical droning voice of a Cyberman filled the room.

"We will go to war for the supremacy of the Cybermen with Earth as our battlefield. Delete the opposing species and upgrade the human race-"

"There we go, short and sweet," The Doctor said, turning off the speaker. "They're going to war against each other, not Earth. But Earth is where they're going to fight. Killing two birds with one stone."

"But why Earth?" Rose asked. The Doctor looked at her sadly.

"It's disposable."

"But…we aren't going to let them get away with it, are we?" Rose asked in panic. He didn't reply. "Doctor?" He raised his eyebrows at her.

"…of course not! Rose Tyler, what a low opinion you have of me."

"So…got a plan?"

"Nope."

"An idea at least?"

"Nope."

"Have you got a clue what you're doing at all?"

"…no."

"Well you better get your act together!" Rose said, then frowned. "I feel so sorry for my planet's people right now…"

*meanwhile, in a hotel room on Earth*

Darren's POV

Suddenly, I jerked awake and bolted upright. From the faint light coming in through the thin hotel curtains I could tell it was about midday. Normally I would be fast asleep, but something had woken me. I felt a great sense of unease as I got out of bed…something was wrong. As I was trying to figure out what, the light from the window suddenly disappeared as a huge shadow passed over it. I hurried past Harkat's sleeping form to the window, took a deep breath, and pulled back the curtains…

…then wrenched them shut again. No. Way. Taking a deep breath, I opened them again. It was still there, hovering in the sky, blocking the sun. It wasn't imaging it-the people on the street bellow were screaming hysterically, running around in terror or collapsing on the street, sobbing. A few people even fainted, which was understandable. It was all I could do not to faint myself. I stood there, frozen for a second, before taking the best course of action I could think of.

I ran to Mr Crepsley's room and burst in, then shook him awake (he had to sleep in a bed-the hotel didn't have coffins, funnily enough).

"Mr Crepsley! Get up! Seriously, get up now!" I yelped, my voice full of panic. He rolled over, pulled the covers over his head and grunted for me to go away. For the sake of the Gods… "WAKE UP!"

"What?" he snapped, sitting up, looking murderous. "What is it that could possibly be so important in the middle of the day?"

"There-"

"Is it vampaneze?"

"No, but-"

"Are we under attack by humans?"

"No. BUT-"

"Then it cannot be important!"

"Fine!" I said in exasperation, going over to the window. "If you won't listen, look!" And, ignoring his shouts of anger, I ripped the tape from the window to reveal what had shocked and terrified me so much.

"It cannot…what…" Mr Crepsley stuttered, his eyes wide.

"Yes," I said snappily. "There's a bloody massive SPACESHIP outside! Is that important enough for you?"

In response, he leapt out of bed, tripped over a discarded pillow and dashed from the room, yelling at Harkat to get up.

Now that is a rubbish way to be woken up.