This theory is a continuation of my Mind Flayer is Eleven’s Brain Tumor Theory. In my latest Stranger Things Theory, I break down the possibility that the Upside Down Dimension is just Eleven’s Subconscious Mind Realm and the Mind Flayer and Demogorgons are just mental representations of her brain tumors growth. I’ve found a few clues that could point to this possibility.
Like I say in the video I’m still leaning toward the first possibility that the Upside Down is a real parallel dimension, not Eleven’s mental realm, but in a way it kind of makes more sense for all of this to be occurring in Eleven’s mind, if she is indeed the cause of it. What do you think?