Uh, no, not...necessarily.

[how does a dog explain the multiverse theory to a bat that is a literal preschooler...]

It's more like...everyone here is from very, very different places. To the point that...it feels much more fitting to say we're all from different worlds. So we can't help but think that it's true, and that we are all from different worlds-though not necessarily different planets.

Does that make sense?

[That is about the simplest way he can think to put it.]