I was reading lately about the theory of Multiverses. Well, After getting a brief veiw of it, I thought that it was quite possible. I mean, having different Universes compiled into one huge multiverse.
But from what else I've seen on the subject, it's very plausible. There's plenty of evidence in that we have little evidence to any theories of the origin of the universe (that I am aware of).
Almost anything is possible when it comes to this.