In trying to find out more about the supposed shield generator around the Upside Down, Dustin discovers a notebook from Dr.

Eleven accidentally created the Upside Down when she opened the gate in Stranger Things season 1. This happened during her ...

The Upside Down has always felt like the heart of ‘Stranger Things‘. It looks like Hawkins, but something is clearly off.

However, viewers were kept in the dark until season five's second batch of episodes, now streaming on Netflix.

"Stranger Things" Season 5, Volume 2 finally reveals the origins of the Upside Down. Here’s how the wormhole works, what the ...