The Mind Flayer is Eleven's Brain Tumor - Stranger Things Theory

In this Stranger Things theory, I discuss the possibility that the Mind Flayer Hive Mind is actually just the manifestation of a brain tumor spreading inside Eleven's head, which is secretly feeding off Eleven's untapped psionic power. This video is Part 1 of 2, so check out Part 2, which will include a different possibility based on this same basic theory.