A/N: This story was written by me and a friend (Aerena) on Google Docs. We don't own the Doctor, BBC, Doctor Who, River Song, Melody Pond or the TARDIS but we do own coffee.

Out in the depths of the universe, beyond any mortal thought or dream, something was stirring. Stirring from the peace in which it had been sleeping all this long millennial. It slowly opened one eye, and then the other, two giant orbs in which all time and space was reflected. It knew everything: past, present and future. Something was changing, changing in the very fabric of time as it had not done for a thousand years. And this being was determined to see whatever happen. No, it wouldn't miss out on this one chance. Slowly, the events would be put in place. The dominoes would fall. And then something would happen as it had not happened for a very, very long time: the saving of the world.

Rain poured down from the sky in buckets. Everyone was walking to and fro, eyes downcast as though to avoid this horrid weather. Thus, the pedestrians did not notice a blue old-fashioned police box seemingly appearing out of thin air, and a man and a woman emerge from it, arguing.

"You need to turn the brakes off! They could have alerted everyone in the area to the fact that we came here! And besides, do you want the government tracking us down?"

"So? We're always being tracked down by one government or another. Besides, I like the brakes. Brakes are cool."

The woman shook her mop of curly blonde hair. "Fine. Don't blame me when the Galactic Law Enforcement hunts us down."

The man with the bow tie gave her a sidelong glance, his green eyes looking at her curiously. "There isn't any Galactic Law Enforcement."

She gave him a mysterious glance. "That's what you know. . ."

"Let me guess. Spoilers?" he sighed regretfully, only half joking.

"You know me that well already, do you, sweetie?"

Cassi glanced up from the sidewalk, her face protected from the rain by a brown hoodie. A blue police box sat not far away and a low voice echoed in her thoughts.

'That is it. The TARDIS.'

Cassi looked it over skeptically. "It doesn't look like much, are you sure that's it?" she whispered.

'It may not look like much, but an army could fit inside.'The voice responded.

"But how is that possible?" she whispered, making her way slowly toward the box.

'I have told you, the Doctor is an alien, as am I.'

Cassi looked over and saw a man and woman arguing in front of the box and she took a small step toward them.

'Careful! The man is the Doctor! He must not know we are here!'The voice sounded almost fearful and Cassi wondered why. She backed away, head down. The Doctor stopped mid-sentence, turning to look behind him.

'You must not let him see you.' The voice whispered as she walked further from him. 'But you have to take the key, the key is the only way into the TARDIS. And he has it.'

"But Ky'lle, how do I take the key without him seeing me?" She asked, receiving a couple odd looks. Lowering her voice she looked down at the sidewalk. "And who's the woman with him?"

'I do not know who the woman is, but the Doctor travels with companions everywhere. She is likely some pitiful human who follows him like a dog, so she should not be any trouble. And as for getting the key, you will figure out how to get it somehow, no need to worry.'

Cassi glanced back at the blue box. "I'll try."

The Doctor snapped his fingers and the TARDIS doors locked. He turned to River, leaning in a bit so as not to lend any secrets to unwanted ears. "We need to find Shadie, whoever that is. She sent me a message on the psychic paper warning that she needed our help, but to beware any alleyways. Not that I don't do that in the first place, alleyways are evil. People always wait to ambush you."

River kept looking straight in front of her. "Got it. No alleyways, find a person named Shadie. But sweetie, no one would ever ambush you with me around. I'll take care of anyone that comes near us." She turned to look at him, but he wasn't there.

"Doctor? Doctor! Where are you?"

She drew her guns, ready for any danger. Looking in all directions, she saw really nothing that could be potentially dangerous, except for one person that seemed to be following her. Taking a swift glance behind her, she saw an alleyway. River had been unknowingly backed up against an alleyway. Peering into the gloom, she thought she could see a figure huddled in the corner. A figure. . .with a jacket. A tweed jacket. And a bow tie. No! She ran over to the Doctor who looked like someone had stabbed him in the stomach, blood spreading. River quickly felt his pulse and started panicking. One heart. Only one heart beating. She looked up as the person who had been following her entered the alleyway. "Who are you? Did you do this to him?"

Cassi looked between the Doctor and his companion, who was shouting at her.

'Quick! Get the key!' Ky'lle shouted and she looked at the Doctor's blood-stained jacket.

"What did you do?" Cassi blurted.

"What did I do? What are you talking about? Who are you?" River stood up and faced the woman in front of her.

'Don't stand there, get the TARDIS key!'

"I can't! I just can't!" she took a step back. "I-I didn't want anyone to get hurt!"

'It doesn't matter, just get the key!'

"No! Get out of my head!" Cassi buried her face in her hands, backing against a wall.

River looked at the girl strangely. "Wha-?"

'Cassi! Get. The. Key!'Ky'lle growled and Cassi stood, no longer controlling what she was doing.

"Wha- what are you doing?" she barely managed to get the words out as she walked over to the Doctor.

"Stop!" River said nervously, and drew both of her guns, aiming them at Cassi. "Stop, or I shoot! Don't touch him!"

"I..."

'Be quiet!'the voice hissed as she grabbed the key from the Doctor's jacket.

River shot her gun, purposely aiming for above the teenager just in case. "Don't take that! You don't know what it can do."

Ky'lle chuckled. 'Thank you, Cassi, but I won't be needing you anymore.'The key disappeared from her fingers as Ky'lle's presence vanished, heading for the TARDIS. Cassi fell to the ground, head in her hands.

"I'm sorry, I'm so sorry." she muttered.

River put her guns back in their holsters and approached the woman quietly, still on her guard. "Sorry about what?"

"About everything! It's my fault the Doctor's hurt, and it's my fault he's got the TARDIS."

River froze. "Who? Who's got the TARDIS?"

Cassi paused. "Ky'lle. He's... he's some kind of alien." she sighed, turning away.

"Who-who are you? And who's Ky'lle?"

They were interrupted by a loud moan from behind them. River ran over to the Doctor and picked him up gently.

"My name is Cassi. But as for Ky'lle, I-I don't know who he is, he's just been this voice in my head for years."

River walked on ahead, holding the Doctor. "Well. Cassi, you can come with us. We need to help the Doctor. And tell me more about Ky'lle. . ."