Underworld2003/I

Singe:
For years, we've been trying to combine the bloodlines. And for years, we've failed. It was useless. Even at the cellular level, our species seemed destined to destroy each other. Yet the key, we knew, was to locate the rarest of bloodlines; a direct descendant of Alexander Corvinus: Hungarian; a warlord who came to power in the early seasons of the 5th century. Just in time to watch a plague ravage his village. He alone survived. Somehow, his body was able to change the disease, mold it to his benefit. He became the first true immortal. And years later, he fathered at least two children who inherited this same trait.

Viktor:
The sons of the Corvinus Clan: One bitten by bat, one by wolf, one to walk the lonely road of mortality as a human. It's a ridiculous legend, nothing more!

Singe:
That may be, but our species do share a common ancestor.

Viktor:
There is a descendant of Corvinus lying there, not three feet from you.

Singe:
Yes, but he is already a Vampire. We needed a pure source, untainted; an exact duplicate of the original virus. The Corvinus Strain itself, which we learned was hidden away in the genetic code of his human descendants. Passed along in its dormant form, down through the ages, to Michael Corvin. His blood allows for a perfect union of our two species.