Originally posted by Cogito
Ok. Here's the deal, as I see it.
We've never really seen multiple multiverses in Marvel, afaik, except for when the LT was supposedly holding two megaverses in his hands. Not even when Thanos had the HOTU. There's been mention of omniversal powers and potential, but that just goes back to my first and second points.
As far as I'm concerned, until we really see it, I'm just going to pretend like it doesn't exist. Sometimes writers want to throw around big words, but I just don't buy it until they back it up with something remotely concrete.
I see. Although not only have we seen other multiverses, and had crossovers, but other multiverses have several titles of their own centered in them.
There was a crossover called Starblast which dealt with a separate multiverse called New Universe.
Here's one confirmation from Quasar #56 (and there are many more) that they come from a separate multiverse:
http://i.imgur.com/Olz5fBr.jpg?1
"We are in another multiverse"
Earlier in Quasar #31, the Watcher says "You went outside the multiverse, into the greater omniverse":
http://i.imgur.com/wWjXsWc.jpg?1
Btw, There are multiple titles which take place in New Universe. I can name them if you want.
-----------------------
Have you heard of the Avengers/Ultraforce crossover? Where do you think the Ultraforce comes from? It's a separate multiverse called the Ultraverse .
It was never referred to as such on panel, but we know for a fact that it's a reality outside the mainstream multiverse, and a 2007 handbook clarifies that it's a multiverse:
http://i.imgur.com/2cu0Pot.jpg?1
"In that other multiverse"
-------------------------
Where do you think Earth-Shadowline comes from? You guessed it, it's a separate reality outside the multiverse. It's a reality with no gods (unlike the mainstream Marvel multiverse), it's mostly filled with Shadow-Dwellers. Here's the scan from Dr Zero #1 (a title which is centered on Earth-Shadowline, which bears no relations whatsoever to the mainstream multiverse):
http://i.imgur.com/3fvGycO.jpg
....Hence why the handbook puts Earth-Shadowline outside the mainstream multiverse but inside the omniverse:
http://i.imgur.com/OzdCLU5.jpg?1
------------------------
Where do you think Trasnformers-reality (pertaining Marvel) takes place? Yup, it's a separate multiverse.
See, Marvunapp puts Transformers outside the mainstream multiverse (inside the megaverse, beside realities such as Earth-Shadowline) because it has a different hierarchy (different cosmic characters which have their own creation story):
Link: http://www.marvunapp.com/list/app8162.htm (see bottom page)
It's a completely separate multiverse with its own cosmic beings and its own creation story (Big Bang):
Transformers (US) #74:
http://i.imgur.com/CM4WqgM.jpg
Transformers Ultimate Guide handbook: The Big Bang:
http://i.imgur.com/lGyoB7u.jpg?2
--------------------------
Want me to continue?

Coz believe me, i could go on and on. That should be enough though.....no?
So not only have we actually seen other multiverses, but there are entire titles centered in those other multiverses.
Of course, while reading those titles you won't see something like "in that other multiverse" because those titles are centered in that other mutiverse. That's like having an Avengers comic saying "Oh hey, we're in a multiverse which is separate from that of the 'New Universe' or 'Earth-Shadowline', etc.. etc..."
How often do you see something like that? .... You don't.