In 1985 Hawkins, the new Starcourt Mall dominates, causing closures. Hopper disapproves of Mike dating Eleven, leading to Eleven befriending Max. Joyce, still grieving Bob, suspects the return of the Upside Down. Will senses its presence, fearing the Mind Flayer's return. Nancy and Jonathan investigate, while Dustin, Steve, Robin, and Erica suspect Soviet infiltration. Billy falls under the Mind Flayer's control, prompting a showdown where Eleven and friends must defeat it for good.