Stranger Things revealed the real origin of the Upside Down, and it flips a key element of the series on its head.

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

Fans finally got answered about the Upside Down in Stranger Things season 5. Here's more of what we know about this world.

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

Stranger Things co-creator Matt Duffer clarifies Eleven's role in the Upside Down's creation after new revelations in season ...