*I'm going to do something weird, you may hate me, but then again, I don't really care. This first chapter is just background info on the situation, the how's and whys of the upcoming actions. Yes, this is a crossover fic for Harry Potter and Hellsing, there aren't very many and some are just evil, but humor me. *

At Hogwarts School of Witchcraft and Wizardry:

"Professor Dumbledore you can't be serious. Bringing muggles into a Hogwarts situation is unheard of, much less something like that-that fiend."

"Minerva, it must be done. The creatures that have come to the school will endanger the students, until we determine who is leading them, making them, he will remain."

"As a teacher!? He has no skills, much less his attitude. He's liable to kill the children faster than the monsters in the dungeon. Did you see what he is?"

"Yes, I saw. And I understand your concern. However, at the moment that vampire is our closest hope at determining who is behind the recent attacks and the appearance of the dementors."

"I just hope he doesn't hurt anyone."

"He knows his place, but figuring how to place him will be interesting. We need a Defense teacher, but I can't see putting a demon to work as a Defense against the Dark Arts Professor. It will have to do; Snape refuses to allow him to be Potions master. "

"And I always thought he wanted that job, though a vampire in potions could lead to problems. I don't suppose he uses a wand?"

"Likely not professor, likely not. He arrives tomorrow; we shall see how he behaves and see what he asks for."

In London, the Hellsing Organization's leader, Sir Integra Hellsing is calling on her vampire Alucard.

"Alucard, I have a job for you."

"Oh, and what will that be my master?"

"You are to go to the mountain regions north of London on a train that leaves the station at 11:00pm tonight bound for the Hogwarts School of Witchcraft and Wizardry. The headmaster there has informed me of most disturbing occurrences, one resulting in the most gruesome death of a teacher. You are assigned to take over the role that professor played and find the culprits."

"In short, I'm to play school while a monster is terrorizing the students, how quaint. I didn't think we took meaningless jobs."

"They are paying us a substantial sum, and I believe that you may know one of the professors, he is a mutual friend or possibly an enemy. Alucard, they are in need, and I have supplied them with my best fighter."

"As you wish, will the police girl be joining me?"

"No, Seras is to remain; only you were called. And Alucard, control yourself, these are children you are dealing with, no killing them."

"Right."

"Walter, this may be a mistake sending him there. If they did not have a demon problem before, they sure as hell do now."

Alucard from the Hellsing Organization has been sent to the Hogwarts School to be a replacement and a watcher; the new students will be arriving in a week's time. How will they adapt to having a vampire in their midst?