There are many different versions of the multiverse theory, even outside of comic books. For example, if space/time is flat and goes on infinitely, there are only so many possibly particle configurations within cosmic patches, so there must be many repeating universes; some that are exactly the same as ours and other that have some differences (and by some differences, what they mean is a particle or two are different) and then a range with more differences, until you had worlds on the other end of the spectrum totally unlike ours. Some theories have new universes springing into existence every time there is a choice of any kind to be…