My theory is that Wolfram and Hart finally accomplish it's goal, stealing Angel's soul turing him back to Angelus, it is revealed that the Snior Partners are in fact the First Evil. Angelus jprceeds to turn his own fang gang into vamps, save for Spike and Lorne (Lorne just gets killed). Angelus plans to bring upn the apcolypse in avery major way, creating his own Hellmouth atop Wolfram and Hart. With The First and Angelus unted with W&H, L.A is declared a human free zone with an army of vamps and demons ruling over it. But to create a hellmouth, Angelus needs a few things that have only been availabe over the first couple of yeras: The Key, The offspring of two vamps,one of the slayer sisters who created the anamoly (Faith) al must be sacarificed along with the blood of a vampire with a soul. Once HE has opened a hellmouth that he created he will become a hell god like Glory who has the power to pull the earth right into the hellmouth (Been done several times)
Angelus's agents manaage to grab Faith and Dawn and Connor, that's when the united Watcher's council gets involved. Buffy comes out of hiding and leads the very much expanded group of scoobs on one final raid on L.A. EVERYONE would be involved in this battle: Buffy with Giles and Xander by her side, a goddess white haired Willow soaring above them, all slayers and watchers, Robin Wood, Andrew, Oz, Spike, Riley and his gang will all unite. So basically, it would be in the big picture it would be W&H Vs. The Watchers Council, but in the smaller picture, The Scoobs Vs. The Fang gang.
The group manages to get through L.a with only minor deaths, but once they get tothe Wolfram and HArt offices, things get insane. Spike manges to be the first to get to Angelus and the two fight to the death, with Angelus bleeding Spike and then dusting him, but Spike is wearing a very familliar necklace, Angelus wears it as a tropohy as his next adversary advances. Angelus takes out Faith , very brutally over a pentagram he created to represent the soon to be hellmouth.Meanwhile, the battle goes down further stories down, Vampire Gunn kills Xander, but is quickly taken out by Willow. Giles destroys Wesley and Fred vamopire versions. Buffy faces off against Angelus right as he kills Connor and Dawn. She stakes him righ as he is descending to hell god status and the hellmouth opens. Oddly enough the dust left behind from Angelus and the amulet falls right ontop of the dbris of what used to be Spike. The amulet begins to glow as the hellmouth opens. Buffy, Willow, and Giles witness the new hellmouth opening and expand as several demons and Turok hans are unleashed.
Willow finds herself transported agsinst her wil into the White Room where she stands face to face with the true face of the First Evil,who explains that the white room is the only place it is corpreal and that he has chosen her as the one who will face him. Meanwhile, Buffy, Giles and the surviving slayers and others battle the horde that is comnig out of the hellmouth. The glowing amulet gives light to a from that Buffy doesn't notice at first. The new figure wearing the amulet begins taking out Turol left and right, Buffy notices that he looks like someone she knows, in fact two people. This new figure is the human shanshued combination of Angel and Spike. Willow defeats The First evil turning the white room red and the whole building begins to crumble as the new hellmouth closes up. Few people manage to make it out alive with their lives. It will end with Buffy, Giles, an even more Goddess like Willow, and we'll just call him Liam the Bloody looking on at the war that just occured and mourning the loss of alot of people
