Wolf is a war veteran who recounts the tale of his legendary youth to a young upstart killer. Flashback to a post-World War 2 time when the young Wolf is wandering the Chinese countryside in search of his missing memories. He only knows to meet someone at an abandoned temple. He ends up hooking up with a local villager, who intends to guide the Wolf to his destination. On the way, they find Wai-Yee, who’s been waiting for Wolf for quite some time. However, Wolf still can’t remember anything, until the bad guys come to find him, and they bear the terrible secret of the Wolf's past.

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.

As the war between the vampires and the Lycans rages on, Selene, a former member of the Death Dealers (an elite vampire special forces unit that hunts werewolves), and Michael, the werewolf hybrid, work together in an effort to unlock the secrets of their respective bloodlines.