Stranger Things has always reminded us how some deeply buried secrets from our childhood can evolve into something frightening and monstrous. However, one plot thread that has haunted fans is that of the briefcase Henry Creel discovers in the mines.In Stranger Things Season 5 Volume 2 Episode 6, Max and Holly, while trying to find a way out of Vecna's mind, accidentally come across one of Henry's memories, where they witness him with an injured scientist who is clutching a locked briefcase. Before they could see what's inside the briefcase, Max pulls Holly aside as she’s found the way.But thanks to some key evidence from the Stranger Things: The First Shadow stage play, a possible answer to what was in the briefcase has finally emerged. The play proposes that the contents of the briefcase would have been some form of experimental work related to the Upside Down, possibly involving the awakening of Henry's powers. This finding might be the crucial start for a troubled youngster to transform into the iconic monster, Vecna, which would proceed to threaten the entire world in the future.The briefcase in Stranger Things Season 5 Vol 2 Episode 6 is a portal to Henry's origin story View this post on Instagram Instagram PostThe briefcase is not just a mystery object; it is the moment that will change Henry forever. Henry kills a paranoid scientist and opens the briefcase in the cave scene from Episode 6 of Stranger Things Season 5 Vol 2. Smoke oozes out, yet we do not see what is inside. That’s intentional. It is the impact it has on Henry.The First Shadow stage play states that the briefcase is some sort of experimental technology associated with Dimension X (the Abyss) and perhaps with the energy of Mind Flayers. Upon opening it, Henry changes; his blood, mind, and abilities start to transform. This marks the actual beginning of his powers, well before Dr. Brenner enters his life.The contents remain concealed in the show; nevertheless, the hints are obvious: the briefcase is not a simple plot gimmick. It is the catalyst that sets Henry on the wrong path in his life and preconditions everything he will become in the future.How this twist reframes the Upside Down View this post on Instagram Instagram PostHere’s the part where it gets even more fascinating: the mystery of the briefcase is more than just an explanation for Henry's powers; it transforms our understanding of the Upside Down itself. Stranger Things Season 5 Vol 2 shows us that the Upside Down is more than just a counterpart world; it is perhaps part of a larger multiverse of interdimensional worlds, often referred to as the Abyss or Dimension X.Also, the relationship between Henry, stolen technology, and secret experiments reveals that the strange supernatural mayhem was no accident. Also, all these aspects: military experiments, interdimensional technology, the Mind Flayer, and super-powered children are interlinked to one another. The briefcase, as a plot element, was thus the catalyst that started all this.In this light, Stranger Things is essentially a warning about what can go awry when humans interfere with forces that cannot be fully comprehended. And as always in Hawkins, nothing is ever as simple as just a briefcase hidden in a cave.For more such insights on Stranger Things Season 5 Vol 2, keep following SoapCentral.