Underworld is a 2003 action-horror film about the secret history of Vampires and a type of werewolf known as Lycans (an abbreviated form of lycanthrope). It is the first film in the Underworld series. The main plot revolves around Selene (Kate Beckinsale), a vampire who is a "Death Dealer", or Lycan hunter, due to her hatred for the whole species. She finds herself attracted to a human, Michael Corvin (Scott Speedman) who is being targeted by the Lycans. After Michael is bitten by a Lycan, Selene must decide whether to do her "duty" and kill him or go against her clan and save him.

While reviewers generally gave the film a negative reception, criticizing the lack of character development and overacting, a smaller number of reviewers praised elements such as the film's stylish Gothic visuals, the "icy English composure" in Kate Beckinsale's performance, and the extensively worked-out vampire-werewolf mythology that serves as the film's backstory.

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