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During the bulk of the concluding season of *Stranger Things*, Holly Wheeler and Max Mayfield find themselves trapped within a psychic prison constructed from the recollections of Henry Creel. The search for a way out in episode 6 has them experience a defining event from Henry's youth—a moment that potentially carries the key to defeating him for good.

Spoiler Warning: This discussion contains major spoilers for the second part of the final season.

A Journey Into the Mine Shaft

When she finds Max in the mental landscape called Camazotz, Max reveals she is sheltering in a grotto that Henry strangely fears. A clever observation a spyglass found in Henry's old home allows Holly to realize that the true terror lies beyond the cave. When she lines up her view through the cap, she and Max suddenly fall into a deep mine shaft.

There, they witness a child version of Henry come across an wounded, fearful individual. Attempting assistance, the man reacts violently, wounding the boy in the hand. In a desperate act of self-defense, Henry strikes the man down with a rock. "Is this what corrupted him?" Holly asks tearfully. It was a factor, but the trauma involved more than a defensive killing.

Similar to other plot points this season, the full story behind the encounter originates in the stage play Stranger Things: The First Shadow.

The Philadelphia Experiment and A Spy's Mission

This backstory explains the 1943 event, which allegedly sent a vessel into a realm later called the Abyss. It faced creatures, and the lone returnee was the ship's commander, who came back in a catatonic condition with an different blood composition.

The captain's son, the future Dr. Brenner, sought to replicate this experiment in Nevada. However, a treacherous employee stole research materials to give to the Soviets, who were desperate to launch their version of the tests. This spy in the mine shaft is that employee.

The Briefcase's Contents

Based on what is revealed about his research, the briefcase almost certainly contained vials of the unique blood type. In the scene, Henry is wounded and bleeding. Exposure likely occurred upon opening the case, leading to the awakening of his powers—abilities he would later pass on to the test subjects Brenner would experiment on.

Alternatively, the box could have held strange particles that was destined to travel to the secret facility, where it acts to anchor the Upside Down. The prequel shows that the boy was transported in the Abyss, reappearing hours later as a different person. As a youth, he struggles with the influence of a malevolent force, reminiscent of how Will was influenced by the Mind Flayer in the past.

A Weaponized Emotion

His lasting fear linked to that memory highlights how profoundly traumatic the incident was for him. Even as he orchestrates the army of monsters and attempts to pull the Abyss into Hawkins, a fragment of his psyche lingers. The villain weaponizes terror, and the series is building toward a final confrontation between Vecna and Will, who has confronted his own deepest fears to fortify himself.

His confrontation has effectively disarmed Vecna. More importantly, Will now is aware of what the monster's own weakness, which could provide a decisive edge in the endgame conflict to come.