Michael Sheen and Bill Nighy star in this vampire thriller prequel, the third outing for the 'Underworld' fantasy franchise. The film tells the story of the origins of the centuries-old blood feud between the aristocratic vampires known as Death Dealers and their onetime slaves, the Lycans. In the Dark Ages, young Lycan Lucian (Sheen) emerges as a powerful leader who rallies the werewolves to rise up against Viktor (Nighy), the cruel vampire king who has enslaved them. Lucian is joined by his secret lover, Sonja (Rhona Mitra), in his battle against the Death Dealer army and his struggle for Lycan freedom.