The arrival of summer typically heralds fresh employment and the promise of affection. Yet, a subtle unease creeps in when Dustin’s radio catches a Russian signal, and Will instinctively feels that something is amiss.

Nancy and Jonathan pursue a clue, while Steve and Robin accept a clandestine assignment. Meanwhile, Max and Eleven run errands. Billy, visibly disturbed, is plagued by unsettling visions.

As El and Max searched for Billy, Will announced a day free of girls. Meanwhile, Steve and Dustin embarked on a stakeout, while Joyce and Hopper returned to Hawkins Lab.

The alarm blared, signaling the team's reunion with a dreadfully familiar threat. Karen pressed Nancy to continue her investigation, while Robin discovered a map proving unexpectedly helpful.

Within the weathered walls of an old farmhouse and in the shadowed depths beneath the Starcourt Mall, unexpected marvels and unsettling mysteries await. At the same time, the Mind Flayer grows stronger.

Dr. Alexei divulges the nature of the Russians' project, while Eleven discerns the locations of Billy's activities. Meanwhile, Dustin and Erica orchestrate a bold rescue attempt.

Time was dwindling, and an assassin remained close on their heels as Hopper’s team hurried back to Hawkins, where Eleven and the children were making preparations for a battle.

A chilling dread descends upon the food court as the Mind Flayer arrives. Yet, deep beneath, in shadowed places, the fate of the world hangs in the balance.