A/N Okay I admit it. I've got the YAHF bug and just had to do this one. I've seen that a few people have done some BTVS and DR WHO cross overs before, but I just have to do my take on it. ROFL.

CHAPTER ONE – TIME OF CHAOS

One Alexander Lavelle Harris, or otherwise known as 'Xander' to his friends was currently standing alone on the side walk. He was supposed to be leading a group of kids in the time honored art of trick-or-treating when the effects of a chaos spell took effect, not that Xander knew it was such at the time. When the spell hit, Xander felt dizzy and disoriented for a moment before it began to clear. All of a sudden he began to take on a posture that looked casual to the everyday observer but which was deceiving. 'Xander' looked around in complete focus and was trying to determine how, who AND why he got there and by what means.

Just what in the name of Gallifrey is going on here? The last thing I remember is battling my arch nemesis the Master on Orion V, trying to prevent the renegade Time Lord from developing a new Time Scatter and Dilution device that he intended to unleash upon the unsuspecting inhabitants of such said planet, in an attempt to use Orion V as a launching pad for his latest insane scheme for galactic conquest!

Now all of a sudden I'm in a small human town surrounded by what looks like a small hoard of miniature inter-dimensional aliens which the primitive apes of this planet happen to know as daemons and vampires? Someone must really hate me! And by the looks of this town, it's definitely somewhere in a western country. I'm probably somewhere in America, by the look of things. Southern California if i have to make a bet on it.

The man's thoughts were interrupted by a thin red head girl who had come up to him in a slight panic, but was addressing him a weird name that he had never heard of before.

"Xander!" Willow exclaimed as the stranger turned to this girl and quickly responded, somewhat in a state of confusion.

"WHAT!"

"Xander! It's me!" The girl exclaimed.

"WHAT!"

"Hey, knock it off!" Willow said, starting to get annoyed.

"Sorry miss I'm afraid I don't know who or what this "Xander' is. My name is The Doctor."

"Xander quit fooling around! This is a serious situation happening here!"

"I'm sorry again but I don't know why you insist on calling me Xander, but I have no idea whom you're talking about."

"But Xander it's me. It's Willow!"

It was at this point during Willow's protestations that the Doctor had managed to get a view of his reflection in a window in a nearby parked car, and sure enough the current body he was in, was not his own. And the Doctor knew for a fact that he had not recently regenerated, so that may be some truth to the girl's words. The only question was how did he end up possessing this young man's body? The Doctor thought for a moment and missed a few words the girl had said. The Doctor looked back at the girl after a moment and politely enquired into what she just had said.

"Sorry miss but I'm not really your Xander at the moment! If I have to guess, I'm currently, temporarily 'possessing' your friend due to a manipulation in the time and quantum energy flux matrix of the space/time continuum of your universe, which just so happens to be one of many alternate realities in the multi-verse! " The man explained, though he had his doubts that this girl would understand.

"Huh? Xander this is no time for jokes! And stop it with your silly Star Trek references!" Willow complained.

"Sorry miss but I am not really joking." The Doctor sighed at the antics of this girl.

"You really don't know me?"

"Sorry, but no. And I highly recommend that we find somewhere safe to go or to take cover, as this place is a bit chaotic at the moment. Then we can work out what is going on here."

Willow sighed as she realised something strange was going on. She had dressed up as a ghost and now it appears she truly was a ghost. Xander dressed up as the lead character from a British show known as Doctor Who. Could it be now that Xander is now that British show hero? Or did he just think he was?

She then noticed that 'Xander' starting to head off, but Willow started to get in his way.

"No wait!" She pleaded even as 'Xander' walked straight through her. This in turn made the Doctor pause in surprise and truly think something strange was going on. While his surprise was minor, it did cause him to think more deeply about what was going on, and even in those few moments of surprise, the Doctor was already coming up with a plan and a solution to this mess.

"Ah I see that you are non-corporeal! How did you manage to get to this state young lady? Humans shouldn't have this kind of technology for at least another three hundred years! Oh but silly me! Never mind me, my mind kind of drifts off every now and then. Are you hurt? Are you harmed at all?" The Doctor asked and with a look of concern plastered against his face.

"Look Doctor. It's a bit hard to explain. I dressed up as a ghost tonight and now I guess I'm really a ghost. You are my best friend 'Xander' and he dressed up as this 'Doctor; from a British Television show and now I guess you really are the Doctor." Willow explained.

"Am I now? Then I think that things are just starting to make senses." The 'Doctor' replied with a silly and goofy grin on his face.

"What do you mean by that? You know what's going on here, don't you?" Willow challenged.

"I'm not entirely one hundred percent sure, but I do have a fair idea." The Doctor remarked even as he frowned.

"But regardless it's not safe here. We should find somewhere safe so we can do something about what's going on here." The Doctor added as he was determined to find out what was going on and to put an end to this mess if possible.

Suddenly a little Vampire rushed out of some nearby bushes and prepared to attack them. Willow saw that the Doctor took a defensive stance even as he was prepared to use some sort of electronic device on the creature.

"No wait! That's only a little kid in that costume! Please don't kill him!" Willow cried out.

"Don't worry my dear Willow. I have no intention to hurt the innocent. I am merely going to persuade him to go elsewhere."

"How?"

"Please pay attention as I do my best do discourage the creature without hurting it too much."

With that reply the 'creature' attacked. But before the creature got within range, the Doctor managed to use electronic device (which suspiciously looked like a small shaver but without the blade) which had been pulled from one of his shirt pockets and the Doctor then pressed a button. The said device emitted a sonic signature which while humans couldn't hear, supernatural or extra dimensional beings could hear all too well. This forced the 'Vampire' back while covering his ears in pain. The 'Vampire' then growled before running off to seek easier prey.

While the Doctor was scaring off the 'Vampire', Willow noticed something further down the street caught the red head's attention.

"Buffy!" Willow exclaimed of a sudden.

"I'm sorry?" The Doctor asked as he turned to Willow after the 'Vampire' had ran off.

Then he turned to see the said 'Buffy' stumbling down the street somewhat dazed and disoriented, wearing it appeared to be an 18th Century noblewoman's dress.

"Buffy is mine and Xander's friend, Doctor! We have to help her!" Willow explained.

"Oh dear. I'm guessing she dressed as an early 17th or 18th century noblewoman, judging from the way she is dressed" Sighed the Doctor. Willow however, paid the Doctor's sigh no heed and promptly headed over to her friend to see if she was okay.

"Buffy! Are you alright?" Willow asked with deep concern.

"What?" Buffy replied in confusion.

"Are you hurt?" The Doctor asked the girl who looked a bit dazed as well as confused to his keen Time Lord senses. But luckily apart from that, was in perfect health.

"Are you hurt Buffy?" Willow asked as well.

"Buffy? Who's Buffy?" The girl who was Buffy asked in response to their questions.

"Oh no. I guess she's not buffy! Maybe she has amnesia?" Willow suggested, as she realised Buffy too was possessed by her costume.

"I believe that is the case. Probably because of the events of tonight so I wouldn't expect too much out of her at the moment if I was you" The Doctor that was in Xander's body warned Willow.

"Yeah okay…. But normally she's much more intelligent and proactive than this." Willow replied a bit sadly.

"What year is this? What is this place? And who is that funny looking man in the coat and strange looking shoes?" Buffy rambled off some quick questions to the strange people in front of her.

"We're friends Buffy." Willow responded.

"Friends? I don't believe we are friends. And who is this Buffy you keep mentioning?" Buffy asked again in confusion.

"And how did I get here to this strange looking place?"

"Perhaps we should get somewhere safe first and then we can talk this over." The Doctor stated as he realized that standing around in the open, on a night like this, was just asking for trouble.

As Willow continued to ask and answer questions with Buffy (with the Doctor starting to look around them warily), all three of them heard another roar. This time a real vampire had appeared, with a smaller demon by its side, which had once been a child trick-or-treating before Ethan's spell.

"This could be a bit of a pickle." The Doctor remarked as he assessed the threat of the newly arrived Vampire and the smaller demon.

"Oh no. Buffy what do we do now?" Willow asked as she turned nervously towards the Slayer. But the Slayer had been affected too and had become a true 18th Century Noblewoman, one who had been scared of her own shadow. And as a result of the Vampire's appearance (who just happened to be in his game face) and his roar, the noblewoman who had once been the Slayer a few hours before promptly fainted.

"Well I did warn you not to expect too much out of her Willow. She did dress as a Victorian Era noblewoman after all." The Doctor sighed.

"Yeah but….." Willow started to protest before she was interrupted.

"It's getting dangerous here. We should leave." The Doctor stated even as he bent over to pick up the fainted 'noblewoman' and carried her in a fireman's carry in one arm, while holding his sonic screwdriver in front of him to ward of the impending attack.

"You're not going anywhere, blood bags!" Growled, the large vampire, even as the Doctor got ready to defend Willow and the now helpless Buffy.

"Ah, I see that you're not one of the possessed are you?" The Doctor asked the vampire, even as his eyes narrowed towards the Vampire.

"What the hell are you playing at fool. I'm not one of these blood bags," the Vampire growled back in reply

"Then back off creature if you wish to live. This is your warning, and you only get ONE." The Doctor warned, even as his voice started to take a dark overtone, even as he pointed his sonic screwdriver towards the vampire.

"Ha! You dare threaten me blood bag? I don't think so!" The vampire retorted and the small demon a few yards behind him growled as they attacked.

Time seemed to slow down as the attackers launched themselves at the humans. The Doctor truly didn't want to kill anyone if he could avoid it but he realised he had no choice if he was to protect the humans. And it was his job to get them to safety.

"Right then! Don't say I didn't warn you!" The Doctor told the Vampire as he pointed and then activated his sonic screwdriver at the Vampire. The vampire only had time to blink, before he was gripped in agonizing pain. The vampire continued to struggle against the sonic attack before quickly succumbing to the attack and thus was quickly rendered to dust by Time Lord Technology. The small demon growled when he saw his friend turn to dust, he was lucky in the fact he was a few yards behind and that the Doctor had no intention in harming him. The small demon quickly ran off before he too met a similar fate.

"What the? How did you do that?" A curious Willow asked the Doctor.

"Well the answer is a bit complicated I'm afraid. And we don't have much time to get to a safe place. Perhaps I could explain later?" The Doctor suggested to Willow.

"Sure. But don't think you're getting out of explaining Mister!" Willow said to the Doctor.

"Oh perish the thought." The Doctor replied. He truly didn't understand human females sometimes.

"Willow, is there a safe place where we can go to right now?" The Doctor asked as he put his mind to getting the girls to a place of safety.

"Sure, we can go to Buffy's house. It's just down the road, not too far away from here and Buffy has a spare key around her neck so we can use that to get in."

"Very good, Willow. Lead the way to the house. It is better we get off the streets at the moment with all this chaos going on around us."

And with that, Willow led the so called Doctor down the street towards the direction of Buffy's house, who was still carrying the Slayer in a fireman's carry, while all the time thinking of a way he could possible solve this strange situation. During his many years travelling time and space he had been in many dangerous and hairy situations. But this might be possibly the strangest one he had ever been in.