I was wondering if the apocalypse referred to is the kinda apocalyptic scenery which is at the moment going on in the streets of L.A. in "After the Fall"

But aren't they in other dimension? Um, another other dimension? (I'm getting confused by the the plethora of alternate dimensions :))))

You should give Whedons run on "Astonishing X Men" a try.

Thanks for a tip. I think I will try. I'm a newbie in the world of comics, BtVS is my first comic ever, but I slowly adapt to the medium.