The next incorporates spoilers for Stranger Issues Season 5, Quantity 2.
“Every little thing we now have ever assumed concerning the Upside Down has been lifeless improper,” Dustin (Gaten Matarazzo) says in Stranger Issues Season 5, Quantity 2. And the way proper he’s.
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The most recent batch of Stranger Issues episodes blows the present’s world-building vast open, revealing what, precisely the Upside Down is. However that is not all. It additionally offers us extra element into the mysterious dimension the place Henry Creel/Vecna (Jamie Campbell Bower) has been hanging out, which Dustin cash “the Abyss.”
So what is the take care of the Abyss, and the way is it related to our world and the Upside Down? Let’s break it down.
What’s the Abyss?
Jamie Campbell Bower in “Stranger Issues.”
Credit score: Netflix
On the planet of Dungeons & Dragons, the Abyss is “a realm of pure chaos and evil,” as science trainer Mr. Clarke (Randy Havens) describes it. That makes it the proper namesake for the alternate dimension that Henry has made his house. Earlier than the discharge of Season 5, Stranger Issues followers referred to this world as “Dimension X,” a reputation that comes not from any dialogue within the present, however from the launched script for the Season 4 finale.
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Separate from the Upside Down, the Abyss is a yellow-tinged world stuffed with bleak mountains and floating rock formations. It is also the unique house to creatures just like the Thoughts Flayer and the Demogorgons. As Holly (Nell Fisher) discovers in Season 5, Quantity 2, if you happen to undergo one of many rifts within the floor within the Abyss, you will end up falling by means of the Upside Down.
The Upside Down is a wormhole, not an alternate dimension.

Randy Havens in “Stranger Issues.”
Credit score: Netflix
For Stranger Issues‘ complete run, our heroes have assumed the Upside Down is an alternate dimension, just like the Abyss seems to be. Nonetheless, that could not be farther from the reality. As an alternative, utilizing Dr. Brenner’s (Matthew Modine) notes from Hawkins Lab within the Upside Down, Dustin realizes that the Upside Down is definitely a wormhole connecting our dimension and the Abyss.
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Stranger Issues has been hinting at this reveal all through Season 5. Look no additional than its references to A Wrinkle in Time, which options wormhole-like tesseracts. Or how about Mr. Clarke totally educating a category on Einstein-Rosen Bridges, aka wormholes?
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Henry, the Thoughts Flayer, and the Demogorgons have been utilizing the Upside Down as a path to get to our world. And in the event that they’re ever gravely wounded in our world or the Upside Down, as Henry was on the finish of Season 4, they’ll at all times retreat again up into the Abyss. That explains why not one of the crawls ever situated Henry: He was biding his time up within the sky.
How was the Upside Down wormhole created within the first place?

Credit score: Netflix
Presumably, the Abyss has at all times existed in parallel with our world, however how did they find yourself related? The reply: Eleven (Millie Bobby Brown).
In 1979, following the bloodbath at Hawkins Lab, Eleven banishes Henry to the Abyss. It is not the primary time he is been there. Because the play Stranger Issues: The First Shadow confirms (and Quantity 2 hints at), younger Henry discovered himself teleported there whereas exploring a Nevada cave system.
After Eleven banishes Henry, Dr. Brenner focuses on attempting to get her to search out him psychically. These experiments led her to make contact with a Demogorgon again within the void, all the best way again in Season 1. When she did, that created not simply the gate to the Upside Down, however the Upside Down itself, bridging the 2 worlds.
Nice, so what does unique matter need to do with all of this?

Credit score: Netflix
Dustin does not simply uncover that the Upside Down is a wormhole. He additionally learns that your complete bridge is being held collectively by unique matter, which is the roiling ball of vitality he, Steve (Joe Keery), Nancy (Natalia Dyer), and Jonathan (Charlie Heaton) uncover hovering over Hawkins Lab in Indiana.
Unique matter is an actual scientific time period. In line with BBC Science Focus, “It is the generic identify physicists give to matter with bizarre properties. Precisely how bizarre is dependent upon the world of physics.”
For the needs of Stranger Issues, although, unique matter is the supply of vitality that retains the partitions across the Upside Down wormhole collectively. If it is destroyed, the entire bridge goes down — together with anybody in it. The destruction of the bridge will show essential to our heroes’ plan to cease Vecna from becoming a member of the Abyss to our world.
So now that we have gotten that impromptu physics lesson out of the best way, the stage is about for what’s shaping as much as be a large finale. This is hoping everybody makes it out alive.
Volumes 1 and a couple of of Stranger Issues Season 5 are actually streaming on Netflix. The sequence finale premieres Dec. 31 at 8 p.m. ET on Netflix and in theaters.
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