The Doctor held the phone in his hand after he hung up on Dean. He wondered if he made the right choice. He wondered if they were sane, or like their father. It wasn't that the Doctor disliked John, but it seemed that John didn't like the Doctor. At all. John was always paranoid, especially when it came to his sons. The Doctor had only met John Winchester once, and briefly. John didn't like the fact that the Doctor wasn't human, and that he wouldn't answer what he was. It was when Dean stood up for him that John walked out. After that case, the Doctor left for his own universe, thinking that he had caused enough damage.

Entering the cafe again, John Watson looked up, surprised at the Doctor. He noticed when the Doctor didn't sit down, even if he meant to be sneaky. However, John said nothing as the Doctor sat next to him and stared at Sherlock. He wanted to notice what John had noticed earlier. That Sherlock wasn't acting like himself. Soon, Amy bumped his arm.

"What are you doing?" she hissed as the Doctor looked at her.

"What?" he asked quietly as Rory took over the conversation.

"You're staring. You never stare," Amy replied as the Doctor shrugged.

"It's nothing," he whispered, giving her a look meaning that they would discuss it later. Amy thought about arguing, but decided not to. She didn't want to cause a scene. They returned to the conversation as Rory asked Sherlock a couple of questions about the cases.

After a while of rather dull stories, the Doctor's mobile rang. Amy gave him a quick, confused look as he excused himself. She knew something was up, but she wasn't ready to ask just yet. If there was something he wasn't telling her, she would either figure it out or get it out of him. Regardless, she just watched him leave the cafe and put the phone to his ear.

The Doctor glanced at the number before answering. It was Dean, but under another name to make sure that he was safe if anyone got the phone. He put it against his ear as he walked down the alley.

"Are you at an airport?" the Doctor asked, causing the person on the other line to sigh.

"Yes. We're at the Lincoln Airport. The next plane leaves in twenty minutes. Is that the one you want us to take?" Dean answered, slightly irritated.

"Yes, that's the one. It should be about eight hours, but it should be an overnight trip," the Doctor replied as Dean started to laugh.

"I hate you."

"No ya don't. Now, I'll send you the tickets under the name Jack and Scott Harkness, okay? Don't you dare miss that plane, or I will come get you," the Doctor warned, hearing Dean swallow on the other line. He could hear Sam asking questions and starting to panic. "And Dean, let me talk to Sam."

"I really don't think that's a good idea," Dean answered after a moment of silence.

"I can tell that he doesn't trust me. Why would he? We've never met. Put him on the line so I can talk to him," the Doctor pleaded as shuffling and arguing came through. Finally, a sigh echoed.

"What?" Sam implored, annoyed and a little angry.

"Hello Sam. This is the Doctor."

"Yeah, I figured that much out. What do you want? Why is Dean so keen to trust you?" Sam demanded, surprising the Doctor.

"I need your help. My friend is most likely possessed, but not by a demon or a ghost that I have met before. And Dean and I have worked before on a case when you were still at Stanford," the Doctor informed as Sam went silent.

"How did you know that?"

"Dean told me. I am a very trustworthy person, Sam. People seem to tell me about all their troubles and concerns. Not sure why, though. Anyway, I understand why you don't entirely trust me," the Doctor continued as Sam listened. "Your father didn't, either."

"What do you know about my father?" Sam whispered, interested, but still mad.

"I met him once. Briefly, I might add. Your dad went hunting and Dean was tracking a werewolf. I helped him, and your father found out. When he heard about my... condition, he raced to his son's side and yelled at me. Dean stood up for me, which made your dad rather furious. He left quickly and I never saw him again," the Doctor explained shortly before Sam took a deep breath.

"Condition?"

"I'll explain myself when you get here, or you can try and ask Dean. However, you may believe the truth better if I tell it. It can be rather complicated," the Doctor warned.

"Can't you tell me now?"

"There's not time. I have to go find a computer to buy your tickets. Remember Harkness. Dean will understand," the Doctor said before hanging up. The Doctor looked up and around, hoping that the Winchesters would still come to help. He sighed and walked back toward the cafe and up to John. "Can I borrow your laptop?"

~~PD~~

Sam scoffed and handed the phone back to Dean, who looked worried and frustrated.

"You honestly trust this man?" Sam inquired as Dean shrugged.

"The only thing he ever did was help me out. He saved my life," Dean answered as Sam shook his head.

"He said that Dad didn't like him. Why not?" Sam asked, surprising Dean.

"That is a hard question to answer, Sammy. I don't know if you would believe me."

"The Doctor mentioned that, too. What is he, Dean? He said that he had a condition, and when Dad found out, he hightailed it to you. Is he even human?" Sam continued as Dean shrugged, walking into the airport. "What aren't you telling me?"

"Sam," Dean whispered as he turned around. "There are things that I didn't know existed until that man came along. And I did find out about his 'condition', if you can call it that. He isn't human, but he isn't a demon nor a ghost."

"Then what is he?" Sam murmured, curious and concerned. Dean looked down as he put his hands in his hips.

"It would really be better if I had him explain it," he argued.

"No, Dean, I don't think it would. If he isn't human or a demon or a ghost, what is he? Shapeshifter?" Sam pried, walking up to Dean.

"You wouldn't believe me if I told you."

"What would make you think that I would believe him? He doesn't even have a real name. He could be a new kind of demon for all I know!" Sam informed while Dean looked him in the eye.

"He isn't, Sam. He's good. Nothing good comes from a demon," Dean warned before walking in. Sam sighed and followed, not knowing what his brother was getting them into.

At the desk, Dean walked up to the lady and smiled. She smiled back as she stood up from her desk.

"How may I help you?" she asked kindly.

"We're here to pick up two tickets to England under the name of Harkness," Dean informed smoothly, making his brother smile. The lady nodded and returned to her computer, telling them to wait a moment. Dean gave Sam a quick smile before she stood up again.

"There you go, Mr. Harkness. Enjoy your flight," the lady grinned before returning to her seat. Sam looked baffled when Dean turned around with the tickets.

"I'll be honest. I didn't think that the Doctor would be able to get actual plane tickets. How much do you think that costed?" Sam whispered, amazed and concerned. Dean shrugged, trying to ignore his brother's confusing emotions.

"Who cares? Let's just get this job done," Dean smiled as they walked to the terminal.

~~PD~~

The Doctor closed the laptop lid and looked around the flat. He wondered how long it was since Sherlock was Sherlock and not some thing inside of him. Did he even get to see the real Sherlock? Was that why he was so keen on forgiving him? The Doctor sighed and put the laptop on the coffee table before Amy came in.

"What are you doing?" she asked before sitting across from him. The Doctor glanced up and bit his lip.

"I just bought two plane tickets," the Doctor whispered as Amy widened her eyes.

"Alright, Doctor. I've been patient. What the hell is going on?" she demanded as he stood up to comfort her. Amy backed away, confused.

"Sherlock is possessed by something. It might be the Gelth, but it isn't likely. I called in some specialists and-"

"You want me and Rory to get out of the way?" she finished as he shook his head. "Doctor, it's going to take a lot more to get rid of us. I thought you would have known that by now."

"I'm not getting rid of you or Rory! I bought the tickets for the specialists. They live in America," the Doctor clarified before Amy straightened, slightly embarrassed.

"What kind of specialists?"

"I don't think you believe me if I told you," the Doctor warned as Amy crossed her arms.

"Try me," she countered as he took a deep breath.

"Alright, I called in two brothers; Sam and Dean Winchester. All their lives, they have hunted and killed monsters. Werewolves, vampires, ghosts, but mostly demons. They travel the country searching for these to take them out. I think they might be able to help us out," the Doctor answered. Amy cleared her throat, doing her best to believe.

"Why are they coming exactly?" she whispered, worried.

"Because John and I have reason to believe that Sherlock isn't Sherlock anymore. I want to make sure that this isn't another invasion of aliens or whatever else is out there," the Doctor explained, worrying Amy.

"How do you know that there's something wrong with Sherlock? He seems fine to me," she argued, making the Doctor grimace.

"That's the idea. However, Sherlock is never this friendly. I was surprised that he forgave me, and that was my first mistake. I disregarded my surprise, thinking that it felt good to be forgiven. I should've seen the signs, though. Sherlock doesn't keep grudges, but he knows who is his friend and who pushes him away," the Doctor continued while Amy sighed.

"Sounds plausible. What do we do?"

"We have to wait until the Winchesters get here and make sure that Sherlock doesn't do anything illegal or deadly. I think John will make sure of that," the Doctor explained as Amy nodded. "They should be here by morning."

"Really? What's going to happen to Sherlock, Doctor?" Amy asked, almost accusatory. She didn't like that the Doctor was making plans behind her back, especially when it came to demons. And she really didn't like it when the Doctor answered with silence. "Demons, huh? That's new."