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During the bulk of the fifth and final season of the popular Netflix show, Holly Wheeler and Max are held captive inside a mental fortress constructed from the memories of Vecna. Their quest for an escape route in episode 6 leads them to witness again a life-altering moment from Henry's youth—a discovery that may just hold the secret to his downfall for good.

Heads Up: This discussion reveals crucial plot points for the second part of the final season.

Unearthing the Secrets of the Tunnel

After locating Max in the psychic realm dubbed Camazotz, Holly discovers she is hiding out in a grotto that Henry strangely fears. A clever observation a viewing device pilfered from Henry's old home helps Holly understand that the true terror lies outside of the cave. When she lines up her view to the cut-out, she and Max plummet into a abandoned tunnel.

There, they witness a young, eight-year-old Henry encounter an wounded, fearful individual. Attempting assistance, the man reacts violently, hitting him in the hand. In a desperate act of self-defense, Henry kills the man with a rock. "Is this what corrupted him?" Holly asks tearfully. The answer is affirmative, but the trauma involved more than a simple act of survival.

In keeping with mysteries this season, the significance of the encounter originates in the stage play The First Shadow.

A Naval Mystery and Secret Science

The play reveals the legendary naval test, which reportedly teleported a warship into a plane dubbed the Abyss. It faced creatures, and the sole survivor was the captain, who returned in a unresponsive state with an altered blood type.

The captain's son, the future Dr. Brenner, attempted to recreate this phenomenon in the Nevada desert. But a disloyal lab worker stole research materials to give to the Russian agents, who were eager to begin their own interdimensional projects. This spy in the mine shaft is that employee.

Unlocking the Mystery

Given what is known about the doctor's experiments, the case most likely held vials of the unique blood type. At that moment, Henry is bleeding from his hand. Exposure likely occurred upon opening the case, causing the development of his psychic abilities—powers he would inadvertently transfer to the test subjects in Hawkins Lab.

A second theory, the case could have held strange particles that was destined to travel to the Hawkins lab, where it maintains the stability of the mirror dimension. The stage play explains that Henry was transported in the Abyss, coming back after half a day fundamentally changed. From then on, he fights the whispers of a sinister presence, much like how Will was possessed by the shadow monster in an earlier season.

The Power of Fear

The reason Henry avoids the cave linked to that memory highlights how utterly horrifying the encounter was for him. While he commands the army of monsters and seeks to merge the Abyss into Hawkins, a piece of the scared boy still exists. Vecna uses fear, and the show is setting up a climactic battle between Vecna and Will, who has overcome his greatest terrors to become stronger.

His confrontation has neutralized a key tactic of Vecna. Furthermore, Will now knows what Vecna himself fears, potentially giving him a decisive edge in the endgame conflict to come.