This is a mix of research from S.A Onion's files, and other sources. I apologize: my explanation is crap.

There are 13 realms, some call them universes, I do a lot,this can cause ton's of confusion.

Anyway, 13 realms. They were created in the 'beginning', our realm (that might not be our realm, but actually a universe...) containing Earth, Jupiter, Saturn, Venus, stars, Galaxies etc is one of them. But on top of the 13 realms ( in red ) , there are other universes (In ugly diarrhea). The Universes exist in parallel to the realms. Every time someone makes a decision in one of the realms, a new universe is created for each way the decision would go. However it's the same for the universes, each time someone makes a decision, a replica universe is created (making it probably impossible to tell the difference between universes and realms).

On (our...?) Earth, there are some theories to do with parallel universe's. Mostly to do with Quanta (quantum particles).In separate experiments, Quanta (eg photons-the carriers of all electromagnetic waves) have given results as waves, and separately as particles. One theory says that in one universe , the scientist finds themselves looking at particles, but in another the exact same scientist finds themselves looking at wavelengths.

Obviously there are other theories, (one says the quanta and forced to choose when you look at them. Like in a [approximate, my memory is rubbish] Zen saying: If a tree falls in a wood and no-one is around to hear it, does it make a noise?). Plus this is all theoretical.

Even so, it has quite frightening (no, bloody terrifying) prospects against the Sitnacs. If we are a universe,we are either destined to win or loose, someone has already made the decision, or will do soon, it's all down to fate I suppose. If we are a realm, we have the choice, maybe, someone still might have already made the action that effects everything.

What the hell, we still need to try, and S.A could be the one who shows us what to do...