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During the bulk of season 5 of *Stranger Things*, Holly Wheeler and Max Mayfield find themselves trapped in a realm of memories forged from the past of Vecna. The search for freedom in episode 6 leads them to relive a defining event from Henry's youth—an event that potentially carries the key to defeating him for good.

Spoiler Warning: This discussion reveals crucial plot points for *Stranger Things* season 5, volume 2.

Unearthing the Secrets of the Mine Shaft

After locating Max in the mental landscape dubbed Camazotz, Holly discovers she is taking refuge in a cave that Henry avoids at all costs. A clever observation a spyglass pilfered from Henry's old home allows Holly to realize that the true terror lies outside of the cave. When she lines up her view with the shape, she and Max tumble into a abandoned tunnel.

There, they witness a young, eight-year-old Henry come across an injured and paranoid man. When Henry tries to help, the man panics and shoots, striking Henry in the hand. In a desperate act of self-defense, Henry strikes the man down with a rock. "Did this make Henry evil?" Holly wonders aloud. The answer is affirmative, but the trauma involved more than a defensive killing.

In keeping with mysteries in volume 2, the truth about the mine shaft incident was first explored the stage play The First Shadow.

A Naval Mystery and A Spy's Mission

The play reveals the legendary naval test, which reportedly teleported a U.S. Navy ship into a realm known as the Abyss. It faced creatures, and the lone returnee was the ship's commander, who emerged in a unresponsive state with an altered blood type.

This man's son, the future Dr. Brenner, sought to replicate this phenomenon in remote Nevada. However, a treacherous employee stole research materials to hand over to the Communist spies, who were eager to begin their own interdimensional projects. The man in the cavern was that very thief.

So, What's in the Case?

Given what is revealed about Brenner's work, the container almost certainly contained some of the altered blood. At that moment, Henry is bleeding from his hand. Exposure likely occurred upon handling the contents, which triggered the origin of his telekinetic gifts—traits he would inadvertently transfer to the kids in Hawkins Lab.

Another possibility, the container could have held dark matter that was destined to travel to the Hawkins lab, where it helps stabilize the mirror dimension. *The First Shadow* reveals that young Henry ended up in the Abyss, returning after half a day with a new blood type and personality. Throughout the play, he struggles with the control of a dark entity, reminiscent of how the character Will was controlled by the Mind Flayer in an earlier season.

A Weaponized Emotion

Henry's enduring terror of that cave shows how profoundly traumatic the event was for him. While he controls the collective consciousness and works to collapse the Abyss into Hawkins, a piece of the scared boy still exists. Vecna uses fear, and the series is building toward a climactic battle between Vecna and Will, who has overcome his own deepest fears to gain strength.

Will's growth has neutralized a key tactic of Vecna. More importantly, Will now knows what the monster's own weakness, potentially giving him a decisive edge in the series finale ahead.