A briefcase that young Henry opened in Stranger Things volume 2 is linked to his origins as Vecna, as shown in the prequel play of Stranger Things.

"Stranger Things" Season 5, Volume 2 finally reveals the origins of the Upside Down. Here’s how the wormhole works, what the Abyss is and how it all connects to Vecna.

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?

For fans, Stranger Things Season 5 Volume 2 coming out on Christmas was one of the biggest events in television this year.

The new ‘Stranger Things’ LEGO set is set to release January 3, 2026, or January 1, 2026 for Insiders, and it’s expected to sell out fast. So, if you want to ensure you get it, make sure to sign up for LEGO Insiders (free) to get early access.

With an 84% critics’ score, Stranger Things Season 5 is the series’s lowest-rated season on Rotten Tomatoes. The highest-rated season, per Rotten Tomatoes, is Season 1 (97%), followed by Season 2 (94%), Season 4 (90%), Season 3 (89%) and then Season 5 (84%). The Stranger Things series finale debuts on Netflix and in select theaters on Dec. 31.

According to 'Stranger Things' co-creator Ross Duffer, 1.1 million people have RSVP'd to watch the series finale in theatres.

Brenner’s notes explain that the Upside Down is a wormhole connecting Hawkins, Indiana to another dimension. Dustin dubs that world “the Abyss” because in D&D, it is “a realm of pure chaos and evil.” Image: Netflix Hopper (David Harbor) is less than enthusiastic about yet another D&D reference,

The final battle begins December 31—but first, we have praise and a few nitpicks to pass along to Netflix and the Duffer Brothers.

Stranger Things season 5 is going quite badly, and there is one big reasons for why that's happening, which could have been avoided.