Warning: contains Stranger Things Season 4 spoilers.

Season 5’s Major Unsolved Mystery

In all the demobat venom-hubbub and gate-discovering excitement, that revelation fell a little by the wayside, more of a ‘huh, add that to the weird list’ than a staggering breakthrough. But in a new spoiler-filled post-Season 4 interview with Deadline, Stranger Things creators the Duffer Brothers have confirmed that the revelation is much more than just another item for the weird list. The Upside Down being stuck on that particular date is Season 4’s major unsolved mystery and the driving question for the show’s final outing.

Ross Duffer told Deadline: “The biggest [question] being we set up in the Volume One finale how the Upside Down is stuck in time on the day of Will’s disappearance. That’s something we don’t answer in Volume Two, and that is really the key plot point, the key question that is going to drive our final season as we try to wrap up this story and give the rest of the answers out.”

Challenge accepted, Duffers. That noise you can hear? It’s the sound of a million Stranger Things nerds pushing pins into corkboards and connecting their theories up with red string. Why is the Upside Down frozen in time on the day Will was taken?

Theory: Vecna Created Hawkins in the Upside Down

How about: he built the Upside Down version of Hawkins in the same way a spider builds a web with which to catch and keep its prey? Then on November 6th 1983, Eleven opened the gate, and… that’s where your theories come in. Any advance on that?

Stranger Things Seasons 1 – 4 is available to stream on Netflix now.