This is partly because of Bill S.' post on time in the multiverse, and mostly because I saw these posts from Ethan Siegel.
Why we think there’s a Multiverse, not just our Universe
Are Parallel Universes Real?

Ethan touches on a number of factors in the quest for the multiverse. Basically he takes an approach which ignores the many world hypothesis proposed by some scientists. He looks at the inflationary theory that produced the big bang for our universe. He says that what the universe looks like depends to a large extent how the inflation happened. He discusses how inflation works, and some variations that could have happened. And he points out that many of the different scenarios could have happened through time in different parts of the total universe. Let's, for this discussion call the totality of all that is or may be, a megaverse. That would mean that there could be many different universes in the megaverse that contains our local universe. Our universe then is one small part of the megaverse and there may be many (an infinite number?) of other universes. The primary difference between the different universes would depend on the exact scenario under which their inflationary periods occurred.

Ethan also includes some discussion of the possibility of infinity, so that should excite Bill S.

You better go ahead and read the links. They are a lot clearer than I am.

Bill Gill

C is not the speed of light in a vacuum.
C is the universal speed limit.