It's certainly satisfying to get the answers about the Upside Down that have evaded audiences for so long, but, in some ways, all of these explanations come with a new set of questions.

Turns out Dr. Brenner’s dad was part of the experiment, hence his obsession with Dimension X, Henry's powers, and the Upside Down. Meanwhile, the technology in the briefcase transported Henry to Dimension X and he, per Deadline, "returned with a unique blood type, a different personality and new powers."

The second volume of Netflix’s ‘Stranger Things’ Season 5 sets the stage for an explosive finale where the residents of Hawkins will finally go face-to-face with Vecna. However, before that, the three episodes provide some crucial answers about what has actually been happening in Hawkins all these years.

Stranger Things has been hinting at this reveal throughout Season 5. Look no further than its references to A Wrinkle in Time, which features wormhole-like tesseracts. Or how about Mr. Clarke fully teaching a class on Einstein-Rosen Bridges, aka wormholes?

Review: The explanations get complicated as the Hawkins campaign figures out a plan against Vecna in Stranger Things: Season 5, Vol. 2.

The fourth season of Stranger Things confirmed something that fans of the series had long suspected: that Will Byers ( Noah Schnapp ), the awkward Hawkins, Indiana, kid whose disappearance in Season 1 was the catalyst for this nearly decade-long journey into the Upside Down, is gay.

Having high expectations from the finale episode, one reviewed Volume 2 by saying, "Just finished Stranger Things Season 5 Volume 2 and it was terrible. A complete letdown. I don’t know what Duffer Brothers were smoking while writing it. Waiting all these years for this was beyond disappointing. Only the finale can save the sinking ship now (sic)."

Shawshank Redempton' director Frank Darabont was happily retired—but then the Duffer brothers asked him to direct episodes in 'Stranger Things 5.'