uhh so haiya well this is pretty much my first crossover fic of any kind and i am pretty nervous so

but please do review and stuff and tell me how i can improve

and also i dont think i'll be updating very often but idk ok

also, this was partly inspired by both the stories 'Changing Circumstances' by Eclipse Wing and 'De-Aged' by The Bibliomaniac both of which are amazing-

On a whim, four TARDISes and their pilots crash and merge into each other, blowing a hole between realities. The hole closes, fortunately, but with four Doctors stuck on the wrong side. With three de-aged, and the one who isn't stuck with minding them, all four decide to hole up somewhere to find a way back. It really would have worked, too, if that somewhere hadn't have happened to be Hogwarts School of Witchcraft and Wizardry. And it would have most certainly worked if they hadn't arrived in 1991, the very year Harry Potter begins at Hogwarts.

At four different points in time, four blue boxes and their pilots whizzed through the universe, trailing starlight in their wake.

In one, a man with close-cropped dark hair and steely blue eyes was stretched out on the grated floor, head under a round console in the centre of the odd room. He was surrounded by an amalgam of tools and contraptions, seemingly enacting repairs on the console. So engrossed in what he was doing, he didn't notice when a stray finger brushed against a coupling of wires, and the single one that fell from the bundle.

In another one, much similar to the first, a man in pinstripes and sneakers checked a scanner, only to find it blacked out. Frowning, he flipped, pulled and hit a multitude of switches, levers and buttons. When the screen lit up, he didn't even notice that one of those switches that he had flicked should not have been flicked.

In the third, vastly different to those, another man, this one with flopping brown hair and a bow tie checked through different hatches on the sides of the room. At last, he found the right one, and after propping it open with a pointy thing, he retrieved something and left. However, he didn't remember that he left it open, and certainly didn't notice when it swung shut, a faint clattering sound signifying that the pointy object had fallen into the cavity behind it.

And finally, in a room not the dissimilar to the previous, an older man with a stern expression finished with scrawling equations on a blackboard, placing the chalk on a nearby desk. When he turned away, it rolled, rolled, rolled down the steps and fell neatly into a small hole in the floor.

At four different points in time, four Type 40 TARDISes and four Doctors heard and felt a mighty and terrible crash.

Now, in one single moment in time, the four Doctors turned. They looked at each other.

And, as would be expected, all hell breaks loose.

"YOU!"

"YOU!"

"ME!"

"US!"

And as the interior constantly bzzt-ed back and forth between one of a grungy room, another of a cool blue tinted, and one other similar except for a second floor, these four Doctors argued amongst themselves.

"What are you doing here?! What've you done to my TARDIS?"

"Your TARDIS?! This is mine! What have you done to mine?!"

"Oi! I'm the one asking questions, Chin Boy!"

"Chin Boy?! Like you can talk, Dumbo!"

Back and forth went the one wearing a leather jacket and the one in the bow tie.

"Woah, woah, woah, wait! Stop! Stop! Okay, so, clearly, something's merged our TARDISes, but how? Last time this happened, well, not last, but last time, shields were down, unless-No, really?! All of us had our shields down at the same time? Same, well, not same-You know what I mean! And-what in the blazes are you wearing?!"

This time, it was the pinstriped man who cut in. It left those two stopped for just one second. Eleven, as he was, frowned.

"It's bow tie! Bow ties are cool!"

Nine, as he was, groaned.

"No, don't tell me I'm gonna regenerate into HIM?! Skinny idiot who can't stop talking and has a porcupine for hair?!"

Ten, as he was, spluttered.

"Hang on, what? Like you're any better, all ears and leather! Look at me, I'm the Doctor, I have no hair!"

Just like that, the din started up again.

But not a moment longer, a sharp voice filled with disdain stopped them in their tracks.

"Yes, and when you're all done being utter fools of yourselves, maybe you'll appreciate the fact that the universe might implode."

Twelve, as he was, spoke quite dryly, and if one also accounted for his Scottish brogue, found it enough to silence the younger three. In the time that his younger selves had taken to bicker, he had stabilised the console interior to his own.

Or, at least, until another insult was thrown.

"No! You?! Those eyebrows? I would never! Not in a thousand years!"

"You've redecorated! What is this? Where are all the round things? It's rubbish!"

That was all it had taken.

"Well, you won't think that in a thousand years, then, will you?!"

As the dam broke, it brought with it a slew of insults, each bombarding each other with all manner of degrading comments, remarks and names.

The cloister bell sounded; a deep, ominous chiming that caused all of the Doctors to look to the scanner. It beeped.

That was all the warning they got before the whole room began to seemingly spin upside down and all over the place.

They panicked.

And promptly butted their heads together.

Hard.

The four Doctors all fell down, unconscious, in a matter of ways.

For one, Twelve just sort of crumpled. Eleven spun slightly, then fell. Both Nine and Ten fell backwards in a dead faint.

But, the TARDIS now lacked any pilot of any kind.

From the outside, a blue box was tumbling through space at an alarming pace. Lightly sparking and slightly smoking, it flew into a rift of a kind. It promptly started shrinking after the box disappeared into its glowing depths, until there was nothing but what seemed like a faraway star left in its place.

From there on, the TARDIS began to feel a slight sense of panic.

Thieves, or was it just thief? The thiefs, they were sleeping, and she poked them. Poking them, but none would wake.

She wheezed uneasily. What to do, what to do? They had just come through another crack, into this new-but-same place...No, it wasn't the one with the Wolf. Another? Indeed.

Her thief! She could feel it, their mind, or minds? They were bright as they ever were, but smaller! No, that wasn't quite right. The...outside? That! That was smaller! Oh, oh- it was just three, though. One, three, two.

Fret. Where to go? Well...Oh! Where he always went! There must be! Sol-3-Mutter's-Spiral-Milky-Way-Earth!

And so, one rainy day in London, England, a blue box that had never touched it streets before, landed in an out-of-the-way alley with a wheezing thump.

Overhead, an owl watched curiously before it took off and winged away.