One story I've been planning to write for a long time, is one where Doc and Marty (and Jules and Verne) end up in Narnia.

Now here's the problem I'm running into. Worlds like Narnia, Neverland, the Labyrinth, and the book-version of Oz are all otherworlds. It's not the same thing like with alternate universes, where certain events occur differently - but the world is still essentually earth. If you subscribe to the "everything is real somewhere" theory, then the BTTF Universe and "our world" can be seen as alternate universes.

So the question is, how many Narnias are there? Supposedly, there's only one Narnia - so if our BTTF heroes show up in that universe, then where do the Pevensees come from? Would it be possible for Marty to meet Susan Pevensee (the sole visitor from the series who never entered Aslan's Kingdom) back in the "Land of Man" BTTF Universe?

Also, would be possible for Marty McFly of the BTTF Universe and Alex P Keaton of the FT Universe to end up together in the same Narnia?

These are two very similar concepts, but they are pretty hard to reconcile with each other.

BTW, AlternateStrickland or No Roads, if this isn't the right place to post it - feel free to move it. I know this isn't about time travel per se, but it's about a similarly related concept of alternate realities.

I think the Otherworlds are the same in every universe, for the most part.

This is the confusing thing, though. Are otherworlds separated from any earthly dimension? Of course, in Sabrina the Teenage Witch - you have the Other Realm. You also have a wizarding dimension (not sure what it's called) in Harry Potter. Then, in Buffy the Vampire Slayer, you have all these hell dimensions.

Of course, when you throw religion into this - it makes things all the more complex. I'm not entirely sure if every world ever written about exists in another dimension, because of all these contradicting ideas - but, as one who's admittedly biased, it's really not up to me to say which universes exist and which don't.

One might argue that the BTTF Universe can't exist, due to the very fact that it involves a time machine - but then that takes the whole fun of believing that everything is real somewhere.

One might argue that we've never received visitors from other worlds, but how would we know that? For that matter, how do we know that nobody in our world has ever invented a time machine? Maybe someone did, and the person chose to keep it secret - for the same reasons that Doc did.

This is the confusing thing, though. Are otherworlds separated from any earthly dimension? Of course, in Sabrina the Teenage Witch - you have the Other Realm. You also have a wizarding dimension (not sure what it's called) in Harry Potter. Then, in Buffy the Vampire Slayer, you have all these hell dimensions.

Of course, when you throw religion into this - it makes things all the more complex. I'm not entirely sure if every world ever written about exists in another dimension, because of all these contradicting ideas - but, as one who's admittedly biased, it's really not up to me to say which universes exist and which don't.

One might argue that the BTTF Universe can't exist, due to the very fact that it involves a time machine - but then that takes the whole fun of out believing that everything is real somewhere. After all, Doc could modify the time machine to allow for travel between dimensions.

One might argue that we've never received visitors from other worlds, but how would we know that? For that matter, how do we know that nobody in our world has ever invented a time machine? Maybe someone did, and the person chose to keep it secret - for the same reasons that Doc did.