Broadway has a colossal new star in the Mind Flayer, a fearsome spider-like monster that towers over the Marquis Theatre stage in a bone-crunching, spine-tingling sequence of "Stranger Things ...

Here's everything to know about the Stranger Things season 4 villain, including its origin story, powers and more Kelsie Gibson is the SEO Editor of PEOPLE. She has been working at PEOPLE since 2021.