It's also the home of demons, so it makes a ton of sense that the Duffer Brothers would incorporate this into the final season of "Stranger Things." So how does Dustin explain what's going on here? Let's look at his own words,

Tuesday morning, Netflix dropped what will serve as the final teaser trailer for Stranger Things season 5 volume 2, spelling the end of the Upside Down.

The final Stranger Things season 5 drop is comprised of just one supersized episode, which is officially titled "The Rightside Up."