Title: The Companion

Author: Nemainofthewater

Warning: Spoilers for Supernatural season 4 and Doctor Who up to season AU.

Disclaimer: I don't own anything. It belongs to the BBC and the CW network.

Chapter 2

A strange wheezing sound was heard, and suddenly a blue box started to appear.

For the first time, Jimmy Novak did not look around at the noise.

The Doctor stepped out of the TARDIS, followed by Donna. He walked up to Jimmy, and placed a hand on his shoulder.

"Jimmy, come inside. Amelia is worried about you." He said softly, hoping that he would listen to him one more time.

Jimmy turned around slowly, with an unusually grave expression, and spoke, in a deeper voice than he normally used.

"I am not Jimmy." He stated, and then started to walk away…

…only to have the Doctor level his sonic screwdriver at him.

"Get out of him." The Doctor growled, motioning menacingly with his sonic screwdriver.

"He is not unwilling. He prayed for this." Jimmy, no, the thing that was possessing Jimmy, replied serenely, not seeming the least worried.

"This is your last chance. Get out NOW!!"

"I'm afraid I cannot do that." Jimmy said, and whirled around to see Donna's fist. He swerved quickly to avoid it, and pressed two fingers against her forehead.

Donna sank to the ground, unconscious, and Jimmy turned back to the Doctor, only to crumple as Amelia hit him on the head with a pan.

The Doctor rushed to Donna's side, and checked her pulse, before rising to his feet.

"Tie him up," he ordered, his voice quiet but tight with fury.

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Castiel woke up with a strange pain in his Vessel's head. With a thought he banished the pain, and opened his eyes.

He was tied to a chair, and there was the Vessel's wife, the strange man and the female surrounding him.

"Enough of this," he thought, and he burnt the ropes binding him to the chair.

He stood up, and, quicker than the human eye could follow, unfurled his wings and took off, to where he could feel himself being summoned.

He appeared outside a ramshackle barn, and entered it, hardly noticing the sting as he was greeted by a hail of bullets.

"Who are you?" asked the righteous man.

"I am the one who gripped you tight, and raised you from perdition."

"Yeah, well, thanks for that," he retorted.

Castiel didn't even flinch as the righteous man, Dean Winchester, sunk the knife into his chest.

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The Doctor stared at the space that Jimmy had previously occupied for at least a minute, before he ran over and started to scan the area with his screwdriver.

"Where did he go?" asked Amelia, her eyes red and swollen.

The Doctor was about to reply, when he suddenly found something with his screwdriver.

He dug into his pocket, and removed a small silver key, and a piece of paper that he began scribbling on.

"All right, Amelia. I want you to stay here with Donna until she wakes up. Here's a TARDIS key, if I don't return in 5 and a half hours then call this number and whatever you do, don't come after me. And I mean it this time." He added, with a serious look on his face.

"But where are you going Doctor?" asked Amelia.

"I'm going after Jimmy!" he replied, and before she could say anything else he activated his sonic screwdriver and disappeared…

…And reappeared outside an old barn, just as gunshots shattered the still night air.

"Guns, why is it always guns?" he muttered to himself as he ran into the barn just in time to see a man stick a knife into Jimmy's chest.

He ran forwards screwdriver out and pointed at the man, ready to catch Jimmy as he collapsed.

Only, he didn't collapse; he removed the knife and dropped it as if it was a minor inconvenience much to the shock of the Doctor, and the other man.

He then turned around and caught a crowbar that the third man tried to hit him with.

The Doctor stopped short, stared at Jimmy almost paralyzed with shock. He shouldn't have been able to survive that.

"Who are you?" he heard the other man ask.

The Doctor started forwards again, wanting to hear the reply.

"I am Castiel."

Castiel? That was an unusual name, not common on any of the planets he had visited.

He started to listen again, aware that the other man had asked what he was. It would help if he could identify the species.

"I am an Angel of the Lord."

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Castiel was determined to complete his orders, which meant informing Dean Winchester of his duties.

But as the strange man from his Vessel's house ran into the barn, he was also determined to take care of the threat once and for all.

Yet, there was nothing much he could do. If he unleashed his angelic powers, he would also harm Dean Winchester, and since the man was not a demon, he could not exorcise him.

And so, he ignored him. If this man was intent on following him then he could question him when he was alone, to see whether he had any ulterior motives, or whether he was just concerned for the Vessel.

Then the man ran forwards and Dean Winchester's took his attention off him, and onto the man.

"Go to the back of the room, and stay there," the man ordered, and came forwards immediately, obviously expecting his command to be followed.

"I don't think so," Dean snorted, "Who are you anyway?"

"I'm the Doctor."

"And that's supposed to mean something to me?" Dean replied, his tone incredulous, "Look, just stay behind me, and if I say run, run." He then turned his attention back to Castiel and proceeded to ignore him.

The Doctor stared at Dean, totally dumbstruck as he started to talk to the Angel as if nothing had happened.

"And why would an Angel raise me from hell?"

Castiel found Dean's lack of faith disturbing. But, he reminded himself, this was a time when man had lost a lot of their faith in his Father. Nonetheless, he would have expected the righteous man to at least believe in Him.

"That is your problem Dean, you have no faith." He told him chastising.

Castiel then extended his wings, which, although invisible, made an impressing shadow on the wall behind him.

"So which planet are you from then?" asked the Doctor from his almost forgotten spot in the corner.

"No, in fact, I don't care. Just get out of him." He continued.

"I'm afraid I cannot do that," he replied once again, and disappeared, leaving the Doctor alone in a barn with Dean Winchester.

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A/N: I probably won't update for a while as I'm going to Marrakesh.