There’s a lot there we don’t know or understand. Even with ‘The Upside Down,’ we have a 30-page document that is pretty intricate in terms of what it all means, and where this monster actually came from, and why aren’t there more monsters — we have all this stuff that we just didn’t have time for, or we didn’t feel like we needed to get into in season one, because of the main tension of Will. We have that whole other world that we haven’t fully explored in this season, and that was very purposeful.
We don’t answer all the questions by the end of the season — there are definitely some dangling threads. The hope is that it feels satisfying but that we left room and that if people respond to it we can go back into this world. But if we do get to go back, it’s not a second season as much as a sequel.