What's Inside that Briefcase Henry Opens in the Hit Series?
For much of the concluding season of *Stranger Things*, the young Holly Wheeler and Max Mayfield are imprisoned within a psychic prison built from the past of Vecna. Their mission for freedom in episode 6 has them witness again a defining event from Henry's early years—a discovery that may just hold the means to overcome him permanently.
Spoiler Warning: This article details significant events for the second part of the final season.
Unearthing the Secrets of the Tunnel
When she finds Max in the psychic realm known as Camazotz, Holly discovers she is taking refuge in a cave that Henry avoids at all costs. A clever observation a spyglass found in Henry's old home allows Holly to realize that the source of fear lies not within the cave. By aligning her view to the cut-out, she and Max suddenly fall into a abandoned tunnel.
In this place, they observe a young, eight-year-old Henry find an injured and paranoid man. When Henry tries to help, the man reacts violently, striking Henry in the hand. To protect himself, Henry kills the man with a rock. "Did this make Henry evil?" Holly wonders aloud. Essentially, yes, but the event wasn't just a defensive killing.
Similar to other plot points in volume 2, the full story behind the mine shaft incident was first explored the stage play the prequel play.
The Philadelphia Experiment and Secret Science
This backstory explains the legendary naval test, which allegedly sent a vessel into a plane dubbed the Abyss. Demogorgons assaulted it, and the only one to return was the ship's commander, who came back in a catatonic condition with an different blood composition.
The captain's son, Martin Brenner, wanted to repeat this phenomenon in Nevada. One of his scientists took experimental components to sell to the Communist spies, who were keen to start their parallel research. That traitor in the mine shaft was that very thief.
Unlocking the Mystery
Considering what is known about the doctor's experiments, the case most likely held some of Captain Brenner's infected blood. At that moment, Henry is bleeding from his hand. Exposure likely occurred upon opening the case, causing the origin of his telekinetic gifts—traits he would inadvertently transfer to the test subjects under Brenner's care.
Alternatively, the container could have held exotic matter that eventually found its way to the Hawkins lab, where it maintains the stability of the Upside Down. The stage play explains that Henry ended up in the Abyss, reappearing 12 hours later fundamentally changed. Throughout the play, he struggles with the influence of a sinister presence, much like how the character Will was influenced by the shadow monster in the past.
Confronting Terror
The reason Henry avoids the cave of that cave highlights how profoundly traumatic the encounter was for him. While he controls the Hive Mind and seeks to merge the Abyss into Hawkins, a fragment of his psyche remains. Vecna uses fear, and the show is setting up a final confrontation between the monster and Will, who has confronted his personal demons to become stronger.
Will's growth has effectively disarmed Vecna. Furthermore, Will now understands what the monster's own weakness, potentially giving him a key upper hand in the series finale ahead.
