Now that Marcus has both keys and the knowledge of where the door lies, he opens it and finds William waiting. Selene leads the helicopter to where she remembers a secret passage into the prison and enters, along with a few backups. Once in, they hear the roar of a werewolf and meet up with William. Selene fires at William just as Marcus appears. Selene fires at Marcus, slowing him just long enough to get through the open door and close it behind her. Unfortunately, a bit of rock prevents the door from closing all the way. William catches up with Selene again. She fires at him repeatedly and blows up the cavern in which they are located. Suddenly, all the backups killed by William begin to turn into werewolves and converge on Selene. MIchael leaps from the helicopter into the fracas and helps Selene battle with William. However, Marcus has managed to get the door open, and he, too, joins the melee. The first thing he does is to grab on to a rope hanging from the helicopter and bring it tumbling down into the cavern where it catches on a catwalk and lies there, blades still spinning. Now it's Michael against William and Selene against Marcus. Eventually, Michael manages to behead William, and Selene shoves Marcus into the helicopter blades, tearing him to pieces. In the final scene, Selene realizes as the sun comes up that she is no longer burned by the light, thanks to Alexander Corvinus's blood. She and Michael embrace. In a voiceover, Selene says,
A new chapter lies ahead. The line that divided the clans has now been blurred. Chaos and infighting are inevitable. All that is certain is that darkness is still ahead. But for now, for the first time, I look into the light with new hope.