It's certainly satisfying to get the answers about the Upside Down that have evaded audiences for so long, but, in some ways, all of these explanations come with a new set of questions.

After keeping us in the dark for almost 10 years, Stranger Things has finally revealed what the Upside Down actually is – and as Dustin Henderson says in season 5, all our theories about the dark realm have been "dead wrong" so far. Well, unless you've seen the stage show, Stranger Things: The First Shadow, that is...

Warning: This story contains spoilers for Stranger Things Season 5, Volume 2. Anyone who sat down to watch Stranger Things Season 5, Volume 2 on Christmas Day probably has some questions about that poignant scene between Nancy (Natalia Dyer) and Johnathan (Charlie Heaton) while they were trapped in the Upside Down’s Hawkins lab.

Brenner’s notes explain that the Upside Down is a wormhole connecting Hawkins, Indiana to another dimension. Dustin dubs that world “the Abyss” because in D&D, it is “a realm of pure chaos and evil.” Image: Netflix Hopper (David Harbor) is less than enthusiastic about yet another D&D reference,

Now that Volume 2 of 'Stranger Things 5' is out, and we know what the Upside Down is, we ask 13 questions going into the series finale on Dec. 31.

Stranger Things has been hinting at this reveal throughout Season 5. Look no further than its references to A Wrinkle in Time, which features wormhole-like tesseracts. Or how about Mr. Clarke fully teaching a class on Einstein-Rosen Bridges, aka wormholes?

One of the weirdest parts of the Stranger Things 5 Vol. 2 is Nancy, Jonathan, Steve, and Dustin's trip to the Hawkins National Lab in the Upside Down where they

Season five's second volume has some familiar padding, but it mostly satisfies as the Netflix show races toward its end.

Eight became a big character in the final season of "Stranger Things," but who plays Eleven's vindictive sister?

Netflix has finally dropped Stranger Things Season 5 Part 2 (Episodes 5-7), leaving only the final entry in the Duffer Brothers' sci-fi saga, scheduled to release on New Year's Eve.