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During the bulk of the fifth and final season of *Stranger Things*, Holly Wheeler and Max are imprisoned inside a mental fortress constructed from the memories of Henry Creel. Their quest for a way out in the pivotal sixth episode forces them to relive a life-altering moment from Henry's early years—a discovery that may just hold the secret to his downfall once and for all.

Editor's Note: This article contains major spoilers for *Stranger Things* season 5, volume 2.

Unearthing the Secrets of the Tunnel

When she finds Max in the world called Camazotz, it becomes clear she is sheltering in a chamber that Henry strangely fears. By leaving the lens cap on a telescope pilfered from Henry's old home helps Holly understand that the source of fear lies beyond the cave. Matching her view through the cap, she and Max plummet into a abandoned tunnel.

There, they witness a young, eight-year-old Henry encounter an man who is hurt and scared. When Henry tries to help, the man fires a gun, hitting him in the hand. In a desperate act of self-defense, Henry kills the man with a rock. "Was this the turning point?" Holly questions through tears. Essentially, yes, but the event involved more than a simple act of survival.

In keeping with mysteries this season, the truth about the encounter was first explored the stage play Stranger Things: The First Shadow.

The Philadelphia Experiment and Secret Science

*The First Shadow* opens with the 1943 event, which allegedly sent a vessel into a realm dubbed the Abyss. It faced creatures, and the sole survivor was the ship's commander, who returned in a catatonic condition with an entirely new blood.

That survivor's offspring, a young Martin Brenner, sought to replicate this dimensional breach in remote Nevada. But a disloyal lab worker stole research materials to sell to the Russian agents, who were keen to start their version of the tests. The man in the cavern is that employee.

The Briefcase's Contents

Considering what is understood of the doctor's experiments, the container most likely held vials of the unique blood type. As shown, Henry is bleeding from his hand. It's probable he was infected upon opening the case, leading to the awakening of his powers—abilities he would inadvertently transfer to the kids Brenner would experiment on.

Another possibility, the case could have held dark matter that was destined to travel to Hawkins Laboratory, where it acts to anchor the parallel world. The prequel shows that Henry was transported in the Abyss, reappearing hours later with a new blood type and personality. From then on, he struggles with the whispers of a malevolent force, reminiscent of how the character Will was controlled by the entity in an earlier season.

A Weaponized Emotion

His lasting fear linked to that memory shows how utterly horrifying the incident was for him. While he orchestrates the Hive Mind and works to collapse the Abyss into Hawkins, a piece of the scared boy lingers. Vecna uses fear, and the show is setting up a climactic battle between him and Will, who has deliberately faced his personal demons to gain strength.

This journey has effectively disarmed Vecna. Crucially, Will now knows what Vecna himself fears, potentially giving him a decisive edge in the endgame conflict that awaits.