In the middle of 1985, at the time of the domination of the box office back to the future, Mike and Eleven developed a romantic relationship, just like Max and Lucas. The heroes and heroines of the previous seasons lead an apparently normal life, although a year after the defeat of Mind Flayer, things are not at all what they seem to be in Hawkins, in Indiana. The city has a new manager, the mayor Kline, morally corrupt, whose administration supported and chaired the construction of the new Starcourt shopping center. As July 4 approaches, strange things are starting to happen: Erica, Lucas' sister, discovers a new mysterious threat, and a swimmer of the municipal swimming pool suddenly disappears, triggering fear among those who still have in memory The events of the previous year.
