Underworld's main character is Selene.
Selene , portrayed by British actress Kate Beckinsale , is a fictional character and the main protagonist of the Underworld film series . Underworld (2003 film) . The main plot revolves around Selene ( Kate Beckinsale ) , a vampire Death Dealer hunting Lycans . Underworld (film series) . It tells the story of Selene ( Kate Beckinsale ) , a vampire who works as a Death Dealer , killing the lycans ( Werewolves ) who allegedly slaughtered her family . In this film , Selene takes Michael Corvin , a lycan/vampire hybrid , to a vampire safehouse and plans to return to Viktor 's estate to awaken another elder Markus , whom they discover is the first Vampire and a powerful enemy .