The Abyss explained: Stranger Things reveals the true nature of the Upside Down with another D&D reference
via polygon.com
Short excerpt below. Read at the original source.
The nature of the Upside Down has been one of the biggest mysteries of Stranger Things. Even as the characters have become pros at navigating the parallel universe, they still don’t know much about it. That changes in season 5’s Christmas Eve batch of episodes, when a trip to the Upside Down version of Hawkins […]