Disclaimer: I think it's pretty obvious, but I own neither Doctor Who nor Harry Potter.
Author's Note: This isn't my first attempt at a DW/HP Crossover, but the last time I did this it was almost entirely using the DW script (and inserting Harry into it). While I was intending to build up his roll bit by bit, I decided it was better to just take a break and come back when I had a better idea for the story. Ideally this will be more interesting than the last one, but please let me know.
Prologue
Silence. It used to be one of the most coveted things in the busy streets of London, to escape from the loud hustle and bustle, but now all Harry could find was smothering quantities of it.
Voldemort was dead but it felt like a hollow victory, a consolation prize for the fact that the whole of London was a ghost-town, and as far as Harry could tell that extended to the rest of the world. "It was horribly typical," Harry mused to himself, "that Voldemort would even in death somehow manage to destroy everything I care about. Awfully typical."
The war was going so well - Voldemort had been whittled down to just his inner circle and the end looked imminent. Ron and Hermione had gotten engaged and were preparing for their wedding while Harry was continuing to work with the Department of Mysteries to bring about Voldemort's destruction.
Harry had started working for the DoM after his fifth year when he and the others managed to break in to "rescue" Sirius. Though it turned out to be a trap, Harry and the others were successful in bringing Voldemort to the ministry's attention (forcefully, given their minister's head-in-the-sand attitude) and convinced the DoM to help out the war by providing training.
The problem, Harry had found, was a bomb the Death Eaters had managed to construct in the final days of the war - one meant to kill all sentient life surrounding it. They were in the middle of charging the bomb when Harry and the other Unspeakables had launched their final assault and were able to finish, causing a cascading reaction that destroyed all of the magic users powering the device and setting things in motion.
Within an instant of the device's activation a wave of light had burst forth from that turned all the Unspeakables with him into a cloud of magic that then joined the wave as it swept out of the room. It was the wall of light that had caused the endless silence, a silence all the more damning because when he awoke, Harry found he had survived yet again where others had not.
He didn't know why this was the case, and because of it survivor's guilt ate at him constantly, but Harry had sworn to himself that no matter what happened, no matter why he survived, no matter what the cost, he WOULD make things right. Though everyone was gone, they left everything they owned behind - all of their books, all of their knowledge. Someone must have known something...
[xXxXxXxXxXxXxXxXxXxXx]
Getting into the ministry was harder than normal - though Harry had "access", it seemed the magic keeping everything together was destroyed with the blast. Surprisingly sensibly for the wizarding world anyway, the building was well built and not in danger of collapse though none of the lifts or automatic doors were working nor was the phone booth leading in.
It was looking more and more like he had to try and apparate down to the DoM, hoping that none of the experiments reacted poorly and damaged the island housing them. (What most people didn't realise about the DoM was that the facility, commonly thought as the lowest level of the Ministry building, was actually located on a remote island hidden by various charms and wards designed to prevent discovery. There was actually a portal linking the elevator lobby with the real facility, and the transition is so seamless most people never realize they've moved.)
With a near-silent pop, Harry appeared inside the entrancehall to the department (a solid wall behind him where the elevators would be) and began to look around.
Though the damage wasn't too bad, several of the sections seemed to be collapsed in on themselves or otherwise empty. The Brain Room appeared to be empty, whatever magic keeping the brains alive having been destroyed; The Hall of Prophecies was full of empty shelves, though it seemed unlikely the prophecies themselves were affected; The Love Chamber was unlocked, though a massive amount of stone blocked the rest of the room from view; The Time Room had been cleaned up from the battle where Harry and the others were running for their lives, but the time turners were unrecoverable.
Making his way to the department library, Harry heard a sort of groaning noise as he passed through the veil room. Even with magic having been snuffed out, much like Harry the veil was still very much alive. As he stopped to better hear the source of the noise, it seemed to be getting louder and louder. After a few seconds he was forced to dive out of the way as a blue police box shot out of the veil, missing him by less than an inch as it began to bounce around the room before falling onto its side and crashing into the stairs leading up from the archway.
With a bit of a crash the doors on the front opened as a man, wearing a worn brown tweed jacket and Stetson hat, tumbled out coughing. Smoke was pouring from the box as the man mumbled something unintelligible to himself before collapsing on the floor.
[xXxXxXxXxXxXxXxXxXxXx]
After the man collapsed Harry had been stunned for a brief period - someone ELSE managed to survive and they came out of the veil? - before he jumped forward to try and offer some first aid. Though he wasn't an expert healer, his superiors had felt that he should have at least moderate training given his high-risk antics. Casting a diagnostic spell, Harry had to pause as the readings seemed to contradict themselves.
According to the spell, the man had a heart beating normally and a heart suffering from arrhythmia (due to poison, if the spell was correct, which made his wary of the smoke pouring from the doors). Not only that, but there appeared to be a link formed between the man and his box and Harry had noticed a tendril trying to connect with him as well, though his Occlumency shields were strong enough to stop the passive probe. This muggle, if he even was a muggle, had to be one of the oddest people he had ever met and that was without even speaking to him.
Deciding to trust the spell (weirder things had happened to him, after all) he began trying to stabalize the man without interfering with the link (though the link could be harmful, he would have to wait for the man to wake up before he could be sure). It was slow going, but he managed to clear out most of the poison (enough to stop the arrhythmia) and sighed to himself in relief - He wasn't alone.
