The malevolent entity that rules the parallel dimension known as the Upside Down is the main monster and antagonist of Season 2. What's its name?

The Mind Flayer, also known as the Shadow Monster, is the main antagonist of Stranger Things introduced in the second season. It's a massively powerful being of unknown origin, and wields supreme control of the Upside Down. With murderous intent, it repeatedly attempts to corrupt both Hawkins and the rest of the world.

Asked by Vasilii Kulev · Last updated 5 years ago · 10.4K views · SOURCE