Underworld is a 2003 action-horror film directed by Len Wiseman. The plot revolves around Selene (Kate Beckinsale), a vampire warrior caught in a centuries-old conflict between vampires and Lycans, a race of werewolves. As she delves deeper into the ongoing war, Selene uncovers hidden truths that challenge her allegiance and perception of both factions. The film features a dark, gothic aesthetic and blends elements of horror and thriller genres.