Hi there! I haven't seen a good Crowley is Canton fic before so I was inspired to write one of my own. This takes place right after 5x20 for Supernatural and during 6x2 for Doctor Who(obviously). So without further ado, let's get on with the story!

Disclaimer- If I owned Doctor Who or Supernatural, I would not be sitting here writing this. Doctor Who belongs to the BBC and Supernatural to CW.

"Cas? What are you doing here?" Dean asked, looking up from the book he was rifling through to look at the angel that had just appeared. Sam quietly closed his laptop and looked up expectantly.

"While we may have a… temporary truce with Crowley, it has come to my attention that he may be trying some more unorthodox methods to stop the apocalypse," Castiel replied in his normal, unemotional voice.

"Such as?" Sam asked, sitting back in his chair with a sigh. They had been doing research for a normal hunt, trying to forget the coming apocalypse for the moment. It seemed that the universe didn't want them to have even a brief respite.

Cas turned slowly to Sam. "I believe that he may be using time travel to stop the events that may come to occur."

"He what?" Dean asked, standing up.

"I thought that you couldn't change the past. Everything that had been changed was always going to be changed. Why would him going back make a difference?" Sam questioned. The angel shifted.

"We may not have been entirely truthful," he admitted. He looked like that was all he wanted to say on the subject, but Dean and Sam's glares prompted him to continue. "Time is fluid, but there are certain points that are fixed. You mother's death, for example, was fixed. Nothing could be done to to change that. That is why we had no hesitance in sending Dean back. Most of time, however, is not fixed. If we had sent you to another point in time, it's likely that you could've changed something."

Dean continued to glare at Castiel while Sam walked around the table they had been sitting at to stand protectively near his brother.

"So?" Sam asked, angrily, trying to get off the subject of their parents.

"Crowley has traveled to an important tipping point in history," Castiel explained. "If he changes anything for the worse, you may not exist anymore."

"We have to stop him," Dean said immediately. "When did he go to?"

"1969. The moon landing."

"Really? Is he trying to stop the moon landing?" Sam asked.

"The landing itself is not the important part," Castiel said, frustrated at their lack of understanding. "There were many things going on in 1969 that most humans do not know. It is these things that Crowley is interfering with."

"Could you be any more cryptic?": Dean grumbled. Castiel tilted his head in a bird like gesture but didn't comment, although he did continue speaking.

"It is essential that whatever plan Crowley has is stopped. We cannot have him risking this world. Will you come with me?"

Sam and Dean exchanged a glance. Sam nodded minutely at Dean who sighed.

"I guess we're in. Let's go kick some Demon ass."

The Doctor watched Canton carefully as he bragged about what he had accomplished. He had played his part well. Almost too well, if you asked him, but it did the job. So long as his friends were okay, he wasn't going to pry.

"Nothing can penetrate these walls. Not a sound, not a radio wave, not the tiniest particle of anything." Canton walked over and closed the doors before turning back to the Doctor. "In here…"

He trailed off as the door suddenly started to open again. The Doctor was extremely glad that he hadn't taken the strait jacket off yet and revealed his actual situation. In walked two men in suits with a third in a tan trench coat that reminded him of tenth regeneration behind them. Of the first to men, both were tall, but one definitely dwarfed the other. The taller one had long, brown hair and eyes that the Doctor could tell would get him anything. The shorter one had sandy hair and bright green eyes. It was easy for the Doctor to see the hardships that the pair had been through by their posture and the look in their eyes, but the self blame in the second pair, so accurately reflected in his own, caught his attention. The man that trailed behind them was… not quite right. His piercing blue eyes never wavered from Canton and he held himself with stiff posture. The Doctor couldn't tell what was so off with this last figure, but he intended on finding out as soon as he could get out of this jacket without raising suspicion.

"Every time," Canton groaned, but his accent changed. While before his accent had been American with a slight lilt, his Irish accent was out in the open now. He walked over and re-shut the door. "I don't even know how you got past all the security out there, but can you believe for one minute that I'm trying to save the world?"

"I'll believe it when I see it," the shorter man in a suit grumbled. He gestured at the two body bags and the Doctor. "This situation doesn't really help."

"If you gave me a minute to explain-" Canton started but the short one cut him off.

"I'm sorry, sir. This will be cleared up in a moment," he said to the Doctor. "We just need to have a conversation with this… agent here then you'll be free to go."

"He's already free, stupid," Canton grumbled. The Doctor took this as his cue to shake off the jacket. He was all too eager to enter the conversation with these strangers. He nudged the body bags to give the two people inside the okay and they quickly unzipped. Amy and Rory sat up, coughing.

"Are you okay?" the Doctor asked frantically.

"Finally," Amy grumbled. Her eyes found the three strangers. "Who are they?"

"These things could do with air holes," Rory complained, not having caught on to the situation yet.

"Never had a complaint before," Canton joked, but his attention was obviously on the gentlemen. Rory turned and finally realized that they weren't alone.

"Who are you?"

"Great question, Rory," the Doctor said enthusiastically. He turned to the men expectantly. "How about it?"

The short one glanced warily at Canton who rolled his eyes. "Of course they don't know."

Reassured, although having just peaked the Doctor's interest further, the green eyes turned back to him. "My name is Dean and this is my brother, Sam," he introduced, gesturing at the man with long hair. He then pointed at the man in the trench coat. "That over there is Cas. We're just going to be taking Crowley here and we'll be on our way."

"Crowley?"

"His name," Sam confirmed.

"Will somebody please explain what's going on?!" Amy demanded. Dean's eyes appraised her and the Doctor withheld a sigh. Looks like he was going to have another Jack Harkness to take care of, although hopefully not as bad.

"Maybe for you," Dean flirted, flashing a grin. "What's your name, Sweetheart?'

"Amy, and don't call me Sweetheart!"

Rory placed a gentle hand and Amy's arm that calmed her considerably before turning with steel in his eyes towards Dean. "Hello. Rory. Husband. You'll stop flirting with my wife if you know what's good for you."

Dean shot Rory a surprised look before raising his hands in surrender. "Sorry, dude. Look, we're all trying to figure out what's going on. It's hard to do that though when you get no explanation before getting your ass dragged here."

Dean finished this statement glaring at Cas. Cas looked back at him without any sign of emotion except a small tilt of his head.

"I told you that Crowley was here so this is where I brought you."

"Fair point. He's normally up to something," Dean admitted before turning to the Doctor. "I don't think we ever caught your name."

"Oh, hello! I'm the Doctor!" The Doctor announced, bouncing on the balls of his feet. He hadn't expected any reaction to his name, so when he got one, he was surprised.

Cas's eyes widened, the most expression that the Doctor had seen on his face since the three men had arrived. He bowed his head slightly and greeted the Doctor in return. "Lonely Traveler. I had not realized that you were a part of this. Forgive me for not recognizing you."

Amy and Rory's eyes snapped to him while Sam and Dean looked at Cas in surprise. The Lonely Traveler. It had been eons since he had heard that name. Only one species had ever called him that name.

"No need to apologise," the Doctor said, giving a wave of his hand. "It's been several centuries since I've had any contact with your kind and my face has changed since then."

"Cas, you know this guy?" Dean asked, pointing a finger at the Doctor. He turned to the Doctor. "And more importantly, you know Cas?"

"Not personally, no. Met another one dealing with some zygons that had gotten too close to one of their prophets, or what I would call a human with a strong psychic connection to the dimension called Heaven. Talked a bit. Learned that they had been watching me a bit, which I don't like at all by the way, and was on my way. Haven't heard from them since."

"Doctor, that made no sense," Amy pointed out. Well of course it wouldn't make sense to her. It made perfect sense to him.

"Amy, Rory, let me have the pleasure of introducing you to an Angel," the Doctor said happily. Amy looked at him skeptically.

"An angel?"

"Yes, my full name is Castiel although Dean likes to shorten it. I am an Angel of the Lord"

As Cas said this, there was the sound of thunder and what looked like lightning flashed in the enclosed area. The shadow of two large wings appeared behind the angel before disappearing as soon as the lightning stopped.

"Show off," Crowley muttered. Dean glared at him and he quickly shut up.

"So God is real?" Rory asked, taking a deep breath.

"Real and missing," Dean snorted. The Doctor rolled his eyes and began to explain a bit further.

"Well… Sort of. No offense, Cas. Heaven and Hell are dimensions linked closely to Earth. Yes, what humans call 'souls' generally go to one or the other after death, but while God is the ruler of Heaven and the Angels are his warriors, I don't believe that it's God in the sense that you are saying."

"Dimensions?" Sam asked, his thirst for knowledge breaking through his silent barrier.

The Doctor was about to reply when Dean waved him off. "You two can geek out later. We need to go back to our own time."

"Ah, hunters," the Doctor said, nodding his head knowledgeably. "Well we've got a bit of a problem of our own at the moment and Crowley is the only one that can help."

"We'll help," Sam said immediately. "What's going on?"

The Doctor looked Sam up and down. "Yes, you would like to help, wouldn't you? I don't generally like hunters, too many guns. I'm already stretching my limit letting River have one. Speaking of…" He turned to Crowley. "What happened to her?"

"Jumped off a building."

"She does that," he agreed, no longer worried. "Oh, but wait, if there's an angel and two hunters after you then you're a…"

Crowley's eyes turned red. "A demon, yes." Amy and Rory backed up quickly, which was fairly hard in the small space. Crowley's eyes turned back to normal and he quickly added on, "But a demon that's working to stop the apocalypse at the moment!"

"Why would a demon want to stop the apocalypse?" Rory asked warily.

"Why would the Angels want to start it?" Dean shot back. "It's a messed up world. Cas here is the only one we can trust. The rest are dicks."

"The one I met was fairly rude," the Doctor admitted.

"Probably didn't like that you had to save the prophet instead of his righteous ass," Dean laughed bitterly. "And that reminds me. Doctor, you never explained who you are."

"He's an alien that travels around in time and space in his ship called a TARDIS that looks like a 1960's British police box," Amy said, rolling her eyes eyes when it was obvious to her that the Doctor was going to steer the conversation away from the subject. He glared at her and she stuck her tongue out at him before continuing. "He'll sometimes bring a few humans along with him. We get to go out there, seeing other worlds."

Everybody could hear the note of wonder that entered her voice at the thought of traveling to other worlds. The Doctor smiled slightly. His Amelia Pond. Still looking at the universe through the wonder of a child.

"Aliens?" Dean questioned. "Now I've seen it all."

So how was it? This is only the first part obviously. It's all written out and I'll update in the next couple of days. It will only be 3 chapters with a 4 chapter/epilogue. While this isn't the first fic I've written, this is the first one that I've posted so any feedback would be nice. Feel free to give any constructive criticism, but please be thoughtful! Please follow/favorite/review!