A prequel to the first two Underworld films, this fantasy explains the origins of the feud between the Vampires and the Lycans. Aided by his secret love, Sonja, courageous Lucian leads the Lycans in battle against brutal Vampire king Viktor. Determined to break the king's enslavement of his people, Lucian faces off against the Death Dealer army in a bid for Lycan independence.
| Actor | Role |
|---|---|
 Rhona MitraSonja | Sonja |
 Bill NighyViktor | Viktor |
 Michael SheenLucian | Lucian |
 Shane BrollyKraven | Kraven |
 Steven MackintoshAndreas Tanis | Andreas Tanis |
 Kevin GreviouxRaze | Raze |
 David AstonColoman | Coloman |
 Geraldine BrophyNobleman's Wife | Nobleman's Wife |
 Leighton CardnoFearful Lycan | Fearful Lycan |
 Elizabeth HawthorneOrsova | Orsova |
 Jason HoodDeath Dealer | Death Dealer |
 Mark MitchinsonNobleman | Nobleman |
 Craig ParkerSabas | Sabas |
 Timothy RabyJanosh | Janosh |
 Tania NolanLuka | Luka |
 Kate BeckinsaleSelene | Selene |
 Jared TurnerXristo | Xristo |
| OOlivia TaylforthYoung Sonja | Young Sonja |
 Larry RewKosta | Kosta |
 Eleanor WilliamsTeenage Girl | Teenage Girl |
 Brian SteeleBig Lycan / Creature Performer | Big Lycan / Creature Performer |
| AAlex CarrollYoung Lucian (as Alexander Carroll) | Young Lucian (as Alexander Carroll) |