The first season of "Stranger Things" is often considered its best, and that's mainly due to how self-contained it is. Season 3 and 4 spend a lot of time setting up future events, while season 2 features what feels like a back-door spin-off pilot episode tossed in there. Season 1, then, is the only "Stranger Things" season that focuses on telling a complete, standalone story. Well, almost.

There is, admittedly, a matter that season 1 neglects to expand on, and it gave the show major potential for a multi-season arc going forward: the Upside Down. Introduced as a mysterious alternate dimension covered in alien-like spores and tentacles, by the end of season 1, viewers still don't know what exactly it is or where it comes from. Speaking to SFX Magazine , creators Matt and Ross Duffer re

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