A/N Here we are, the calm before the storm. Sorry, it's a bit late, I had a hard time writing this one so don't have huge expectations. Update next Thursday. Point out errors and enjoy!

Big Brain Motel

Sam, Dean, and the Doctor were seated at the small table in the corner of the room. The hunters were explaining to the Doctor what demons were, while Cas was picking up all of his papers that had been strewn about when the TARDIS materialized. Sam wanted to keep on asking the Doctor about his TARDIS and about him being an alien but there were lives at stake.

"What do you do when you come across a demon?" The Doctor asked.

"We kill them," Dean replied with a straight face.

"Kill them? I thought they were already dead souls?"

"When you kill a demon they go to the empty and they're dead for good," Sam replied.

The Doctor shifted in his seat, he was uncomfortable with the idea of killing but if a demon is already dead then you're beating a dead horse. At least that's what he thought to himself.

"We're pretty sure that demons are involved with this case," Dean said, although he wasn't sure what was what at the moment.

"Demons are involved," Cas said absentmindedly from the other side of the room as he continued picking up papers and pinning them back on the wall. The Doctor shot Castiel a questioning glance, then he remembered that Cas is an angel and can probably notice these things.

"We just have to figure out what they're up to. This isn't an ordinary demon case," Sam said.

"Yeah, demons usually don't have laser guns," Dean said.

"There are aliens involved in this as well." Sam and Dean turned to look at the Doctor, even Cas stopped what he was doing, "Humans don't have the technology to make laser guns, at least not in this century."

"Do you know what kind of aliens they are?" Sam asked, wanting to learn as much as he could about alien life.

"Not yet, but I've narrowed them down to a few species I think," The Doctor said rubbing his chin. Sam was about to speak then Dean cut him off.

"I think I need a few hours of sleep to understand aliens and pretty much everything else that has happened today." Sam kept wanting to ask the Doctor questions but as soon as Dean mentioned sleep he was struggling to keep his eyes open.

"I second that Dean, I can barely keep my eyes open."

"Right," the Doctor said jumping up from his chair, "While you guys do that I have to run some diagnostic tests on my TARDIS to make sure she's running okay."

"Don't go anywhere on us Doc," Dean said.

"Don't worry, she still needs to rest a bit, won't be going anywhere." The Doctor opened the TARDIS doors and letting them squeak shut.

"Damn aliens," Dean muttered as he grabbed his bag and went into the washroom.

"I can't believe that aliens exist," Sam said, "Did you know about them Cas?"

"It has always been the angel's job to protect humans, no angel thought about aliens." Cas turned back to his wall of information on the Doctor re-reading all of the highlighted parts. Sam was digging through his bag and cleaning up his stuff that was strewn about by the TARDIS.

Dean came out of the washroom and stared at Cas, "It's very creepy when you watch us sleep, Cas."

Cas just glared back at Dean, "Fine, I will join the Doctor in his TARDIS."

TARDIS

The Doctor was at the console staring at the Gallifreyan symbols popping up on the screen, he had been trying to figure out why his new addition to the system made the TARDIS crash. Then he heard the familiar creak of the doors open and close, he looked up expecting to see Sam but he saw Cas instead.

"Oh. Hello."

Cas just walked further into the TARDIS looking around, "This ship is unusual."

"I get that a lot. I love it when someone says 'it's bigger on the inside.' It's my favourite part," The Doctor said with a smile.

"It's not only that," Cas said, the Doctor raised an eyebrow in confusion, "Your ship seems to be alive."

"She is alive!" The Doctor said almost defensively. Almost as a response, the TARDIS cloister bell went off. "How can you tell?"

"I can feel it the same way angels feel souls."

"Interesting," The Doctor said then he appeared to be deep in thought. He was trying to remember anything he learned about angels but was drawing a blank.

"How is it that you can see my wings?" Cas asked moving closer to the console.

"Well the Time Lords' psychic abilities are greater than that of a human so I am able to observe things that exist in other psychic planes when I focus enough." Cas looked at the Doctor, trying to figure out what question to ask next.

"Why Earth?" The Doctor just looked at Cas, "If there are so many planets with life why did you choose Earth?"

"The people. Humans are so fascinating, they're nothing like Time Lords."

"Humans are fascinating. It is my job, and all of the other angels' jobs, to protect them."

"You're trying to figure out if I'm a threat to humanity," The Doctor said sounding a little offended, "Believe me I'm not. I've saved this planet from hundreds of alien invasions, and I plan to stop this one too."

"How do you plan to do that?"

"I'm not sure yet. I don't know what we're dealing with."

"That's strange," Cas began, "I saw you here a week ago at the sight of Jimmy Crocket's kidnapping."

The Doctor was surprised by this accusation and Cas got into a fighting stance ready to pull out his angel blade.

Abandoned Barn

"Because of your kidnappings, you dragged the world's best hunters into town!" Krammeyer shouted at Elenor and Colman.

"Just remember whose idea it was for us to help you with your smell!" Elenor shouted back, "You knew the risks when you signed up!"

The room was plunged into silence, all of the demons and aliens watching were too scared to move.

"Let's just pack up and move to another town," Colman suggested. Then the weirdest thing happened, Elenor and Krammeyer laughed.

"Let's just pack up. That would take days!" Elenor said.

"Why leave? We already have high ranking posts in this town!" Krammeyer added.

"But what about the hunters?" Colman questioned.

"Hunters have never fought aliens before, they don't know how to kill you."

"But what about in the park? They stopped us fairly easily then," Colman said, trying to get them to see reason, "I still think we should go."

"They only short-circuited our laser guns in the park, no one was harmed other than Clarrisa."

"I still don't like our situation."

"I've had enough of your complaining Colman," Elenor said as she pulled a device, that looked like a remote control for a T.V., out of her pocket.

"Please no!" Colman pleaded, a look of terror in his eyes, "You don't have to do this!"

Elenor pressed a button, then a purple light started flashing through Colman's body. Colman screamed as the purple light left his body and floated in midair then into a jar that Elenor was holding. Colman's body fell to the ground.

"Who wants to be the new sheriff Colman?"

TARDIS

The Doctor was scrambling for words, trying to find something to say to prove that he isn't hostile.

"I'm a time traveller, I haven't been there yet," The Doctor said, not as calmly as he would have liked. Then a light bulb went off inside his head, "Castiel you are a genius! If I go back in time I can figure out what these aliens are and they won't be suspicious of me then. You're brilliant!"

Castiel was taken aback by the Doctor's sudden enthusiasm, his aggression turning into confusion then into understanding.

"I'm coming with you."

"You can't," The Doctor said fiddling with some of the controls on the TARDIS. He looked up to see Cas staring at him in a very uncomfortable way, "Fine. But you have to stay in the TARDIS. Interacting with your past self is not a good idea."

"Why?"

"Paradoxes and timey-wimey things happen," The Doctor said fiddling with more controls then looking at the screen, "She's going to need to rest a bit more before we can pop back in time."

"How long does she need?"

"A few hours probably. I also don't want to get stuck back there." The Doctor went to sit down in the chair and put his feet up on the console, "What did you learn about me?"

"What?"

"You had a wall in the motel room dedicated to figuring out who I am, what did you find out?"

"You are a mysterious man Doctor, there is nothing concrete about you, not even a photo. Now that I know that you're a time traveller it makes sense that you appear all throughout time, but it still doesn't explain how you have many faces. Is 'Doctor' a title that gets passed down or do you possess humans as vessels?"

"Interesting question. I do not possess different vessels nor is 'Doctor' a title, it's my name. When a Time Lord is fatally wounded we regenerate and when the process is over we have a new face and body."

Castiel nodded in understanding, bits and pieces about the Doctor he had read online were beginning to make sense. He also trusted the Doctor a bit more than he did before, still not fully convinced that he meant no harm but was more convinced than Dean was.

The Doctor and Cas sat in the TARDIS and they exchanged a few stories about their lives, they were small stories that held no significance in their lives other than they were fun times.

A message flashed across the computer screen of the TARDIS and the Doctor grinned, "She's good to go!" He started running around the console pushing buttons and setting the coordinates. In all of the commotion, neither of them heard the TARDIS doors open.

"Where are we going?" Dean asked from the doors of the TARDIS.