The 'Underworld' movies have such a cool vibe—gothic action, vampires vs. werewolves, and that slick blue-gray cinematography. I used to binge them with friends back in the day, and we’d always argue about the lore. Turns out, the films aren’t directly based on books, but they’re heavily inspired by existing mythologies and horror tropes. The screenwriters, Kevin Grevioux and Len Wiseman, crafted an original story, though it feels like it could’ve jumped straight from a pulp novel. Fun side note: Grevioux is a comic book writer too, so the worldbuilding has that dense, layered feel you’d find in graphic novels or dark fantasy series like 'The Witcher'.
That said, there are novelizations of the movies—books written after the fact to expand on the films. They’re worth checking out if you’re deep into the franchise, especially for extra tidbits about Selene’s backstory or the Lycan hierarchy. But if you’re hoping for a 'Game of Thrones'-style adaptation where the source material came first, that’s not the case here. The movies stand on their own, and honestly, that’s part of their charm. They’re unapologetically cinematic, with fight scenes and moody aesthetics that just wouldn’t hit the same way on the page.