Continuing to watch some "Monster Movies" over the next couple months...

2022 Horror Show

#2 - Underworld.

Underworld is a series of dark fantasy action horror films created by Len Wiseman, Kevin Grevioux, and Danny McBride, that follows characters who are caught up in a war between vampires and werewolves (called "lycans" within the films). Most of the movies star Kate Beckinsale as the protagonist, Selene, based on the Marvel Comics character of the same name. The first film, Underworld, was released in 2003; it introduces Selene, an elite vampire-warrior who defies her orders, and Michael Corvin (Scott Speedman), a human who gets caught up in the war.

Underworld tells the story of Selene (Kate Beckinsale) a Death Dealer bent on destroying the lycans who allegedly killed her family. She discovers that the lycans are pursuing a human, Michael Corvin, for experimentation; Selene captures Michael herself to find out what the lycans are up to. Along the way, Selene not only discovers a mutinous plot to destroy the vampire Elders, but also a shocking revelation about her father figure Elder, Viktor.

The vampires and lycans are not supernatural creatures, but rather the product of a mutation of the Plague.

It is revealed in the film that Alexander Corvinus is the first of the vampire and lycan lines. He was the only survivor of the plague that wiped out his village. Somehow, his body was able to mutate the pathogen, mold it to his own benefit. He had three sons, two of whom inherited their father's immortality and were bitten, one, Markus, by a bat, and the other, William, by a wolf, resulting in the vampire and werewolf lines. Corvinus's unnamed third son, who did not inherit immortality, also carried the Corvinus Strain as an exact duplicate of the original pathogen, hidden away in his genetic code and passed along to his human descendants through the centuries. This, according to Singe, is the key to creating a hybrid.

Source:  Wikipedia