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During the bulk of the concluding season of the popular Netflix show, the young Holly Wheeler and Max find themselves trapped in a realm of memories constructed from the past of Henry Creel. Their mission for a way out in the pivotal sixth episode leads them to experience a life-altering moment from Henry's childhood—a discovery that could contain the secret to his downfall once and for all.

Spoiler Warning: This discussion reveals crucial plot points for the second part of the final season.

Unearthing the Secrets of the Cavern

When she finds Max in the psychic realm dubbed Camazotz, Max reveals she is sheltering in a chamber that Henry is terrified of. An accidental discovery a viewing device taken from Henry's old home lets Holly see that the true terror lies beyond the cave. Matching her view through the cap, she and Max suddenly fall into a deep mine shaft.

There, they witness a young, eight-year-old Henry encounter an man who is hurt and scared. Attempting assistance, the man fires a gun, striking Henry in the hand. To protect himself, Henry ends the threat with a rock. "Did this make Henry evil?" Holly asks tearfully. The answer is affirmative, but the event involved more than a fight for life.

In keeping with mysteries of the final season, the truth about the mine shaft incident is detailed in the live show the prequel play.

A Naval Mystery and A Spy's Mission

This backstory explains the infamous Philadelphia Experiment, which allegedly sent a warship into a plane later called the Abyss. Demogorgons assaulted it, and the lone returnee was the ship's commander, who emerged in a catatonic condition with an different blood composition.

That survivor's offspring, the future Dr. Brenner, attempted to recreate this phenomenon in remote Nevada. One of his scientists took experimental components to give to the Communist spies, who were keen to start their parallel research. That traitor in the cavern was that very thief.

The Briefcase's Contents

Based on what is revealed about Brenner's work, the container almost certainly contained vials of the altered blood. At that moment, Henry is already bleeding. Exposure likely occurred upon handling the contents, causing the origin of his telekinetic gifts—traits he would genetically impart to the kids in Hawkins Lab.

Alternatively, the box could have held exotic matter that eventually found its way to the secret facility, where it acts to anchor the parallel world. The stage play explains that young Henry somehow wound up in the Abyss, reappearing after half a day with a new blood type and personality. Throughout the play, he fights the control of a sinister presence, similar to how Will was influenced by the Mind Flayer in the past.

Confronting Terror

Henry's enduring terror of that cave highlights how profoundly traumatic the encounter was for him. While he orchestrates the Hive Mind and seeks to merge the Abyss into Hawkins, a piece of the scared boy lingers. The villain weaponizes terror, and the show is setting up a final confrontation between Vecna and Will, who has confronted his greatest terrors to become stronger.

This journey has taken a weapon from Vecna. Furthermore, Will now understands what the monster's own weakness, potentially giving him a critical advantage in the ultimate battle that awaits.