Let’s look at how the Upside Down has been presented thus far and how what we’ve learned in the finale of Season 4 can change all of that. Major spoilers for “Stranger Things 4” follow.

The question of why the Stranger Things Upside Down is still in 1983 is a big one, and while an answer has been given, fans are still very curious.

According to a new, divisive Stranger Things season 5, Will Byers was never really rescued from the Upside Down in the hit Netflix show's season 1.

Did Eleven create the Upside Down? Is Vecna the Mind Flayer? We’ve rounded up everything Stranger Things has revealed so far about 001 and details revealed in Stranger Things 4 volume 2.

Tales from Hawkins 2 #3, a deadly KGB agent trades Soviet streets for suburban secrets in sleepy Hawkins, Indiana.

The creation of the Upside Down is one of the biggest mysteries on the Netflix series Stranger Things, and fans wonder what part Eleven played.

In the opening scene of Stranger Things, Season 2, Episode 2, Eleven wakes up in the Upside Down. She seems alarmed, but it looks like it’s because she can’t find her friends.

Stranger Things Season 3 revealed that the folks running Hawkins Laboratory weren't the only group aware of the Upside Down, nor were they the only ones working to unlock its mysteries.

Stranger Things 4 featured several shocking revelations, including what the parallel world the Upside Down really is.

Stranger Things season 4: One fan puts forward a theory that Will Byers created the Upside Down. Will the next season introduce us to Will's abilities?