A.N: Hello! *waves cheerfully*

It has been more than a few years since I last wrote and posted something here, so – this is me getting back into the saddle of writing multi-chapter stories *smiles sheepishly* In my defense, life can be, well, life – unpredictable, chaotic, and stressful.

Since I find that the Master didn't get nearly enough screen time, I decided to change a single teeny, tiny detail and give him that time in my first Doctor Who x Harry Potter crossover. ;3

The prologue starts off in the DW world, but chapter one will bring the HP world into the story.

Disclaimer: Sadly, I don't own Harry Potter and I don't own Doctor Who.

xxxxxxxx DW x HP xxxxxxxx

Note: For the purpose of getting the HP timeline synced up with the DW one, I have moved the HP one ahead by 10 years. So instead of Harry's first year at Hogwarts starting in 1991, it starts in 2001, etc.

xxxxxxxx DW x HP xxxxxxxx

Prologue

Free, free, FREE!

After years and years of being trapped in that abominable fob watch He. Was. FINALLY FREE!

Oh, sweet, sweet freedom! The grin dancing at the Master's lips was one of unrestrained joy, the regeneration energy still coursing through him bringing about a sense of euphoria that he was well aware was getting to his head – and he had no intention of toning it down. For the first time in far too long he actually felt alive! The TARDIS rattled and shook as it travelled through the Time Vortex, but even with the resulting precarious footing within the machine the Master couldn't stop himself from dancing around the console, shifting levers, hitting buttons, and turning knobs without any apparent sense or rhyme, his every movement holding not even a single ounce of hesitation.

Being once more his true, Time Lord self was glorious and the Master reveled in it, riding the high of regeneration as he basked in the knowledge that he was back in his proper body: two hearts, respiratory bypass, lower core temperature, and a brain that could think so fast and about so much with ease. Even the ever-present drums sounding out their rhythm of four inside his head in sync with his hearts' beats were a welcome presence.

He felt so, so ALIVE!

The groaning sound of the TARDIS dematerializing tore him out of his thoughts and abruptly brought his focus back to the memory of the Doctor fusing the coordinates to limit the parameters within which the TARDIS would be able to travel. The Master's joyous mood soured. Ah, his clever, clever friend. Former friend? Enemy? Frenemy? Oooh, 'frenemy' had a nice ring to it! His frenemy had tried to strand him; the only question that remained now was to what extent he had succeeded in that. So, where and when had he landed? Circling around the console until he stood in front of the monitor, the information it offered up only served to further annoy him.

Cardiff, Wales, Great Britain, Earth, Milky Way.

Earth. Why the hell was it always Earth? A faint scowl marred the Master's features before he turned his attention from the geographical coordinates to the temporal ones. October 31st, 1989. The date tugged at something in his memory. Wasn't this the day on which some quaint human custom involving sweets was usually celebrated? The idea of sweets immediately restored his good mood and also dragged forth the information that had been on the tip of his tongue. Ah, right, Halloween – a night of sweets, costumes, and tricks. He glanced down at his current attire, absently noting the way Professor Yana's clothes now sat a tick too big on him, and smiled in delight. The 'Ye Olde Times' flair of the white poet shirt, black vest, dark cravat, and 'fob watch' would allow him to blend in quite nicely indeed.

Something about the year bugged him, though – the Doctor's companions hadn't looked like they were from this time period; if anything, their clothing and register had indicated early 2000s. So why had the TARDIS brought him to 1989? Oh. Oh. A small grin slowly found its way onto his lips. Leeway! Hah! Permanently locking the coordinates had worked, yes, but the Doctor had forgotten to account for leeway! It would probably have been several months, but the Master had done better at the Academy than his old friend, no, his frenemy, and he had been just fast enough with his countermeasures to extend that leeway. The best part in all this, however? The Doctor – provided he managed to escape, of course – would assume his last ditch attempt at stopping him had worked exactly as intended. His fellow Time Lord wouldn't go looking for him beyond… hm… the Master brought up the TARDIS's travel log. Ah, the TARDIS's previous stop had been Cardiff, 2007.

Eighteen years. Eighteen years of leeway. Oh, the Doctor had miscalculated and miscalculated badly. The things that could be achieved in so much time…

His and the Doctor's game could continue! And this time it would be a long one. Hah! The Doctor wouldn't know what hit him when he returned – frenemy he may be, but the Master knew him better than anyone and he had every confidence the Doctor would find a way back from the end of the universe. The Master's smile widened until it grew into a grin and the laughter he felt bubbling up refused to be contained, sounding loud within the TARDIS's control room.

This called for CELEBRATION!

How appropriate that he had arrived here on a holiday celebrated with sweets. Besides, he had a new body to figure out and new tastes to learn...

xxxxxxxx DW x HP xxxxxxxx

A.N: Oh dear, not eighteen months, but eighteen years. Such a small detail has been changed, yet what consequences could this bring? How will this affect the course of events, both for the Doctor and for the wizarding world? Read on to find out! ;)

Reviews are a writer's bread and water, so, dear readers, be kind, please, and don't let me starve! *waves good bye and turns to leave*

Master: *storms towards Lady A* No, no, no, that's not how you obtain reviews!

Lady A: *blinks in confusion* Err… it's not?

Master: Humans *rolls eyes* No, there are far better means *grins overly cheerfully* And I will show them to you! I can't leave my benefactor so uneducated, after all.

Lady A: Thank you…? *smiles hesitantly*

Master: Come along, you have much to learn *grabs Lady A and all but drags her away* This is going to be good! Good, good, good, good, good…

Lady A: *bewildered* Apparently, that's good. Anyway – leave reviews, dear readers!