Angel just said in an episode that he had seen three apocolypses about to happen. I need to think of the other one but I know there is one after that.
The one that Spike stops in Season seven of Buffy.
1. When dark Willow decided to go all nutso and destroy the earth. 2. When Buffy had to kill Angel (Angel was opening a portal to Hell, wasn't he?) 3. The First's Uber-vamps, which Spike killed. 4. Glory's splitting of the doors between all dimensions.