I've been working on a plot for a while, and the bulk of it revolves around the main character being whisked away to an alternate reality. The problem is I am having a difficult time deciding what that alternate reality actually is. I have a few concepts but they all seem to have some kind of problem with them. My first thought was it being an alternate dimension. However, some people beleive that there are infinite dimensions, each with a minuscule difference from the last, and this would tear a large hole in my plot. Another thought was it being a different planet in the same universe. The universe is vast and constantly expanding, so that could possibly be explainable. However, it would be tough explaining how there would be humans on two planets light years apart. I was thinking for this option, the second planet would be the original, and thousands of years back they started a colony on earth. However, the technological gap would be too large, and I am looking for two planets with relatively similar technology. Basically, I am torn between different setting ideas. The plot involves there being only a small amount of these different "dimensions," each containing a race that is mostly humanoid, with two (earth and the other one) actually containing humans. I would like to hear some thoughts or ideas relating to my dilemma. I really want to get this out of my way before I can seriously get into writing this. Thanks!