Underworld is a world.
Selene , portrayed by British actress Kate Beckinsale , is a fictional character and the main protagonist of the Underworld film series . Underworld (film series) . 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 .