The truth about the Multivers is finally revealed as the most formidable enemy of all arrives in Sunnydale. As Buffy, Willow and Giles begin to grasp the scale of the endless war that the Killers are waging, other factions are trying to take advantage of it. The Council has worked too hard and too long for an Observer and a rebel Slayer to prevent them from realizing their plan for the Multivers. But with the help of unexpected support and new members of the Scooby Gang, Buffy still has a chance to prove that she is the chosen one. Can she gather enough allies to arrest the great ultimate villain?