What's Inside the Case Henry Opens in Stranger Things?

During the bulk of the fifth and final season of *Stranger Things*, Holly Wheeler and Max Mayfield find themselves trapped inside a mental fortress forged from the recollections of the villain Henry. The search for freedom in episode 6 has them experience a defining event from Henry's childhood—a moment that may just hold the means to overcome him once and for all.

Editor's Note: The following reveals crucial plot points for *Stranger Things* season 5, volume 2.

A Journey Into the Tunnel

Upon meeting Max in the mental landscape known as Camazotz, Max reveals she is taking refuge in a chamber that Henry is terrified of. An accidental discovery a spyglass pilfered from Henry's old home allows Holly to realize that the danger lies outside of the cave. When she lines up her view with the shape, she and Max tumble into a abandoned tunnel.

In this place, they observe a Henry as a boy find an wounded, fearful individual. As the boy offers aid, the man fires a gun, hitting him in the hand. Fighting for his life, Henry kills the man with a rock. "Did this make Henry evil?" Holly wonders aloud. It was a factor, but the trauma wasn't just a simple act of survival.

Like many elements of the final season, the significance of the mine shaft incident is detailed in the stage play The First Shadow.

The Philadelphia Experiment and Secret Science

This backstory explains the 1943 event, which reportedly teleported a warship into a plane later called the Abyss. It faced creatures, and the sole survivor was the ship's commander, who returned in a unresponsive state with an different blood composition.

That survivor's offspring, a young Martin Brenner, attempted to recreate this phenomenon in Nevada. However, a treacherous employee stole research materials to give to the Russian agents, who were keen to start their parallel research. That traitor in the tunnel is the one who stole the materials.

So, What's in the Case?

Considering what is known about his research, the case would assuredly have vials of the altered blood. In the scene, Henry is wounded and bleeding. Exposure likely occurred upon handling the contents, leading to the origin of his telekinetic gifts—traits he would later pass on to the kids Brenner would experiment on.

Alternatively, the box could have held exotic matter that later made its way to the secret facility, where it acts to anchor the mirror dimension. The stage play explains that young Henry ended up in the Abyss, coming back hours later as a different person. Throughout the play, he fights the control of a malevolent force, reminiscent of how the character Will was influenced by the entity in an earlier season.

A Weaponized Emotion

The reason Henry avoids the cave linked to that memory shows how deeply scarring the incident was for him. Even as he orchestrates the Hive Mind and seeks to merge the Abyss into Hawkins, a piece of the scared boy still exists. The villain weaponizes terror, and the show is setting up a final confrontation between the monster and Will, who has overcome his greatest terrors to fortify himself.

This journey has effectively disarmed Vecna. Furthermore, Will now is aware of what his enemy truly fears, which could provide a decisive edge in the series finale that awaits.