Stranger Things 4 featured several shocking revelations, including what the parallel world the Upside Down really is.
Get Ready For 'Stranger Things 4' Volume 2 With Our Upside Down Playlist Made Just For You — Spotify
Stranger Things Season 4 Ending Explained (In Detail)
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Stranger Things' Upside Down explained: Its origin, Vecna, and more - Polygon
Stranger Things' Upside Down explained: Its origin, Vecna, and more - Polygon
Stranger Things: Why the Upside Down Is Hive-Minded, Explained
Stranger Things (season 4) - Wikipedia
The Beauty of STRANGER THINGS 4's Horrifying Upside Down Revelation - Nerdist
Stranger Things 4 ending explained, Stranger Things 5 hints
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Stranger Things' Upside Down Timeline & Origin Explained
Stranger Things 4: Jamie Campbell Bower on Savage Finale, Battle Ahead – The Hollywood Reporter
Stranger Things Chapter Eight: The Upside Down (TV Episode 2016) - IMDb
Stranger Things 4' Ending Explained: Who Died in Vol 2 Finale?