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During the bulk of the concluding season of *Stranger Things*, the young Holly Wheeler and Max are held captive inside a mental fortress built from the memories of Vecna. Their quest for freedom in episode 6 forces them to experience a life-altering moment from Henry's childhood—a moment that potentially carries the key to defeating him once and for all.

Heads Up: This discussion contains major spoilers for the concluding episodes.

The Discovery in the Cavern

After locating Max in the world known as Camazotz, Holly discovers she is taking refuge in a chamber that Henry strangely fears. A clever observation a viewing device taken from Henry's old home allows Holly to realize that the danger lies outside of the cave. Matching her view to the cut-out, she and Max plummet into a abandoned tunnel.

In this place, they observe a Henry as a boy come across an wounded, fearful individual. Attempting assistance, the man panics and shoots, wounding the boy in the hand. To protect himself, Henry ends the threat with a rock. "Did this make Henry evil?" Holly wonders aloud. It was a factor, but the trauma involved more than a fight for life.

Similar to other plot points this season, the truth about the mine shaft incident originates in the theatrical production the prequel play.

A Naval Mystery and Secret Science

The play reveals the infamous Philadelphia Experiment, which allegedly sent a vessel into a dimension known as the Abyss. Demogorgons assaulted it, and the sole survivor was the captain, who came back in a unresponsive state with an different blood composition.

That survivor's offspring, the future Dr. Brenner, sought to replicate this phenomenon in the Nevada desert. But a disloyal lab worker took experimental components to hand over to the Communist spies, who were eager to begin their version of the tests. This spy in the mine shaft is the one who stole the materials.

So, What's in the Case?

Given what is understood of his research, the container would assuredly have vials of the unique blood type. At that moment, Henry is wounded and bleeding. It's probable he was infected upon opening the case, which triggered the origin of his telekinetic gifts—traits he would inadvertently transfer to the kids Brenner would experiment on.

A second theory, the case could have held dark matter that was destined to travel to Hawkins Laboratory, where it acts to anchor the parallel world. *The First Shadow* reveals that young Henry somehow wound up in the Abyss, returning hours later with a new blood type and personality. As a youth, he battles the whispers of a malevolent force, reminiscent of how Will was possessed by the entity in the past.

The Power of Fear

Henry's enduring terror of that cave demonstrates how deeply scarring the encounter was for him. While he orchestrates the army of monsters and works to collapse the Abyss into Hawkins, a fragment of his psyche still exists. Vecna uses fear, and the series is building toward a showdown between him and Will, who has confronted his personal demons to gain strength.

Will's growth has effectively disarmed Vecna. More importantly, Will now is aware of what Vecna himself fears, potentially giving him a key upper hand in the endgame conflict to come.