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Stranger Things already explained what's inside Henry's briefcase but many won't have seen it
Home>Entertainment>TV
Updated 08:27 31 Dec 2025 GMTPublished 19:16 30 Dec 2025 GMT

Stranger Things already explained what's inside Henry's briefcase but many won't have seen it

Stranger Things season five leaves it as an unanswered question, but it was revealed elsewhere

Michael Slavin

Michael Slavin

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Stranger Things season five may only have one episode left to release, but the show still has some fairly major unanswered questions.

One of these centres around a brief snapshot we got into the backstory of Venca (aka Henry) in Stranger Things season five, volume two.

During the middle episode of the volume, Escape from Camazotz, Holly and Max come across a memory of Henry’s, showing the Netflix show’s main villain as a child in a cave. He comes across a scientist with a briefcase handcuffed to his wrist, who shoots at Henry in a panic, before the young boy kills him.

What’s inside the briefcase is never shown and is implied to play a major part in his origins to becoming 001 and later Vecna; however, the biggest of Stranger Things superfans will already know what’s inside.

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The briefcase is hinted to be a major part of his origin in the show, and it absolutely is (Netflix)
The briefcase is hinted to be a major part of his origin in the show, and it absolutely is (Netflix)

What’s inside Henry’s briefcase and how will it affect the Stranger Things finale?

What’s inside wasn’t something shown in a blink, and you’ll miss it moment of the show, but was instead a core part of Stranger Things: The First Shadow.

The prequel play initially only played on the West End before transferring to Broadway earlier this year, but it’s safe to say that the majority of the millions of Stranger Things fans from around the world won’t have seen it.

The play tells the story of a young Henry gaining his powers and being sent to Dr Brenner’s Hawkins Lab.

In The First Shadow, it is explained that the scientist with the briefcase whom Henry encountered in a cave was a Russian spy who stole it from a secret facility.

Jamie Campbell Bower made a cameo in a production earlier this month (Mike Coppola/Getty Images for Netflix)
Jamie Campbell Bower made a cameo in a production earlier this month (Mike Coppola/Getty Images for Netflix)

Dr Brenner’s experiments are described as looking into how his father’s ship disappeared into ‘Dimension X’, which we now know in the show as ‘The Abyss’.

His father returned with changed blood and in a vegetative state. The briefcase contained technology relating to this, with some suggesting it may even be the elder Brenner’s blood.

Regardless of what's most important, what’s most important is that this was Henry’s first exposure to the Mind Flayer, giving him his powers and changing his blood, allowing his blood to be used to create others like Eleven.

Why the prequel play could play a huge part in the Stranger Things finale

Heading into the finale, the prequel play is set to play a potentially huge role.

Speaking about the cave scene in volume one, the first major hint to the play, Matt Duffer said: "When we were working on the play with Kate Trefry, we had Henry’s backstory worked out.

“There was always a balance that we had to find in terms of how much we were going to put in the play. [The director] Stephen [Daldry] and [the producer] Sonia [Friedman] were always pushing for more, and we were pushing back and saying, ‘Well, we have to wait to reveal that in the show'.

"You’ll see, especially as you reach the final episode, there’s more overlap with the play.

As well as the importance of Henry’s backstory to the plot, fans online have spotted a moment from the trailer which seems to indicate the play itself may be addressed.

It appears to show Will, Kali, and Eleven entering Vecna's memories (Netflix)
It appears to show Will, Kali, and Eleven entering Vecna's memories (Netflix)

The finale trailer, which was released earlier today, December 30, has had fans scouring it for clues, with one fan noticing a major part of this.

They tweeted a picture of one particular frame and said: “OHMYGOD THATS A F**KING STAGE.”

Whilst we can probably assume the show isn’t going to suddenly transition to a filmed version of the play, The First Shadow itself features a section in which Joyce puts on a production.

This was briefly hinted at in Volume One when Max went through Venca’s memories, and has fans thinking that there may even be a cameo from some of the important characters from the play.

The Stranger Things season five finale will release tomorrow, New Year’s Eve, at 8pm ET.

Featured Image Credit: Netflix

Topics: Stranger Things, Netflix, TV and Film, TV

Michael Slavin
Michael Slavin

Michael Slavin is LADbible's dedicated specialist Film and TV writer. Following his completion of a Masters in International Journalism at Salford University, he began working for the Warrington Guardian as a reporter. Throughout this he did freelance work about Entertainment for publications such as DiscussingFilm, where he was the Film and TV editor. Now, he is LAD's go to voice on all things Netflix, True Crime, and UK TV, as well as interviewing huge global stars such as Jake Gyllenhaal, Daisy Ridley, and Ben Stiller.

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@michaelslavin98

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