What exactly is the Upside Down in 'Stranger Things'? The wormhole revelation, explained.

The revelatory moment arrives during "Stranger Things" Season 5, Volume 2, when Dustin Henderson (Gaten Matarazzo) comes to ...

How ‘Stranger Things 5’ Finally Explains (Most Of) The Mysteries Of The Upside Down In Volume 2

It's certainly satisfying to get the answers about the Upside Down that have evaded audiences for so long, but, in some ways, ...

What the Upside Down Really Is Explained After Stranger Things Retcons 9 Years of History

Stranger Things just revealed the true nature of the Upside Down, and everyone was wrong about it since the first season.
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Stranger Things just revealed the true origins of the Upside Down (and it’s not what anyone guessed)

The final season of Stranger Things just threw away everything we thought we knew about the Upside Down with an unexpected twist explaining its true origin.