Hellsing Ultimate: Equestria

Long ago, back in the medieval days, more than just humans ruled the earth. The other species was a true threat. Vampires. They sought out the destruction of mankind. Many people tried to drive away these hellish creatures, but nothing could be done. Whole battalions of knights were slaughtered at the hands of these vampires. People became desperate. One man, named Hellsing, founded an organization dedicated to fighting the vampires. With blessed silver blades, the Hellsing Organization cut down vampire after vampire. Once the deed had been done, the Hellsing Organization remained dormant, waiting for another vampire to deal with. Vampires would randomly pop up from time to time, but for nearly a millennium, Hellsing would remain merely a tale mothers would tell their children at night.

However, in 1999, a young woman, the last descendant of the Hellsing family, did war against a vampire army in London. The aftermath of the war was devastating. Billions of lives were taken in the war, most of which were innocent lives, ones that had no idea what was going on. The young woman's name was Sir Integra Fairbrook Windgates Hellsing. Since the war, she had studied alchemy and other magic. She eventually found another world much like her own. However, it was inhabited by anthropomorphic ponies. Now, in her old age, she must pass on the Hellsing Organization to another. And she has someone special in mind. And he isn't from her world.