🔗 Share this article The Mystery Within that Briefcase Henry Opens in the Hit Series? Throughout a large portion of the concluding season of the popular Netflix show, the young Holly Wheeler and Max Mayfield are held captive within a psychic prison built from the memories of the villain Henry. Their mission for a way out in the pivotal sixth episode has them relive a traumatic incident from Henry's childhood—a discovery that potentially carries the key to defeating him for good. Editor's Note: This discussion details significant events for the second part of the final season. The Discovery in the Mine Shaft Upon meeting Max in the mental landscape called Camazotz, Max reveals she is sheltering in a cave that Henry strangely fears. By leaving the lens cap on a telescope pilfered from Henry's old home lets Holly see that the danger lies beyond the cave. By aligning her view through the cap, she and Max tumble into a subterranean passage. In this place, they observe a Henry as a boy come across an man who is hurt and scared. When Henry tries to help, the man fires a gun, striking Henry in the hand. Fighting for his life, Henry strikes the man down with a rock. "Was this the turning point?" Holly wonders aloud. Essentially, yes, but the trauma involved more than a defensive killing. Like many elements this season, the significance of the mine shaft incident is detailed in the live show The First Shadow. A Naval Mystery and A Spy's Mission This backstory explains the legendary naval test, which transported a vessel into a realm dubbed the Abyss. It faced creatures, and the sole survivor was the captain, who emerged in a catatonic condition with an altered blood type. The captain's son, a young Martin Brenner, sought to replicate this dimensional breach in the Nevada desert. But a disloyal lab worker stole research materials to hand over to the Russian agents, who were keen to start their own interdimensional projects. The man in the mine shaft is the one who stole the materials. So, What's in the Case? Based on what is known about Brenner's work, the container almost certainly contained vials of the altered blood. As shown, Henry is wounded and bleeding. He likely becomes contaminated upon opening the case, which triggered the awakening of his powers—traits he would inadvertently transfer to the test subjects in Hawkins Lab. Alternatively, the box could have held dark matter that eventually found its way to the secret facility, where it helps stabilize the Upside Down. The prequel shows that the boy somehow wound up in the Abyss, coming back after half a day fundamentally changed. As a youth, he struggles with the influence of a dark entity, much like how the character Will was possessed by the shadow monster in season 2. A Weaponized Emotion His lasting fear of that cave demonstrates how profoundly traumatic the encounter was for him. While he controls the army of monsters and works to collapse the Abyss into Hawkins, a part of him lingers. Vecna uses fear, and the series is building toward a final confrontation between him and Will, who has overcome his personal demons to become stronger. His confrontation has taken a weapon from Vecna. Crucially, Will now understands what his enemy truly fears, potentially giving him a critical advantage in the endgame conflict to come.