The Mind Flayer, also known as the Shadow Monster or the Brain, is a malevolent entity inhabiting the Upside Down. He was introduced in Stranger Things’s second season, and is considered one of the show’s main antagonists.
The history of the Mind Flayer prior to October 1984 remains a mystery. Exactly how long he had existed for, and how and why he came into existence, is unknown.
In November 1983, an inter-dimensional gate was opened at Hawkins Lab, allowing the Upside Down to begin to spread through. It is not known if the Mind Flayer was present within the Upside Down at this time.
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