In the fall of 1984, Will Byers finds himself the target of the Upside Down as a large tentacled entity called the Mind Flayer soon terrorizes the citizens of Hawkins, drawing back Joyce and Hopper along with Mike's sister Nancy, Will's brother Jonathan, and Nancy's boyfriend Steve, as well as Will's close friends; Mike, Dustin, and Lucas. The whole group along with Californian newcomer Max as well as a missing Eleven must join forces once again to prevent the threat from increasing.