The Doctor crashed through Sam and Dean's window in the TARDIS and slowly opened the door, looking around at the damage he had just caused. "Sorry about that," he said as he stepped over the destruction caused by the TARDIS.
Sam and Dean stared at him incredulously. "Can we help you, Doc?" Dean asked, disbelieving at what just happened, although, he has seen far weirder things, but the Doctor only showed up during the most dire moments.
Sam interjected before the Doctor could answer, "Who or what is trying to kill off the entire human race now? Is the world ending again?" He smirked at the end of the sentence; he was ready for anything.
The Doctor slid is hands into his pockets and looked at the two brothers, smiling his mischievous smile. "Sherlock needs our help."
And with that he turned and strode back into the TARDIS. Sam and Dean followed, knowing they had no other choice. Closing the door behind him, Dean looked around. "I see you have done some redecoration," he said.
The Doctor simply nodded. He didn't redecorate, just cleaned for the first time in about 100 years. He started the TARDIS up and took off to space.
Sam opened the door as they went, the Doctor shouting at him for it nearly the whole time it was open. "Relax, we're just enjoying the view!" Dean said of his brother's behavior as they looked out into the vast void of space, admiring the beauty. "Not all of us see this every day!" Sam added.
"Close the door!" the Doctor yelled, "I need them closed so I can land this thing!" Dean rolled his eyes, but closed the big blue doors anyways. "Alright, Doc." he muttered.
"221B Baker Street!" the Timelord said, roughly landing the TARDIS in the street. "In we go!" he continued with a smile, reopening the recently closed doors and stepping out into the world. He headed for the dark green door of Sherlock's flat with the Winchester's in tow.
When they arrived at the door, Sam went to knock, but before his hand reached the door, it opened to reveal Sherlock standing there, looking very calculated as usual. "Well, what are you waiting for?" he asked, "Back in the TARDIS! Oh and Sam, Dean," -- he looked over at them -- "I hope you brought salt." There was the slightest hint of a smirk on his face when he strolled off to the TARDIS after having said that final sentence.
The Doctor exchanged a look with the brothers, and Sam said what everyone was thinking, "Where's Watson?" Sherlock stopped and turned around. "Well that's the problem now isn't it? Can't you see? Watson is missing, and Daleks are back, demons and ghouls and ghosts and monsters and robots of all kinds have united and are trying to take over the world and Watson is missing! We must find Watson in order to save the universe." Sherlock went on, "He may be incredibly stupid sometimes, but he can be an asset and he is my best friend. We have a universe to save. Now let's go!" he practically shouted the last sentence, then continued his trek to the blue police call box across the street.
The Doctor shrugged, looking at Sam and Dean then said "You heard the man! Allons-y!" he smiled then followed the detective.
Shortly after, Dean looked at Sam and shrugged. "Whaddya say, Sammy? Let's kill some evil sons of bitches and raise a little Hell?" He smirked and he too walked towards the TARDIS. Sam followed, "How bad can it be? It's just the family business."
A/N: Story based off of this gif: http://33.media.tumblr.com/tumblr_lxjx067MMi1qhx4f1o1_500.gif. The gif was not created by me, but the entire story was.