Charlie Heaton

1983, Indiana. A young boy vanishes into thin air. As friends, family, and local police search for answers, they are drawn into an extraordinary mystery involving top-secret government experiments, terrifying supernatural forces, and one very strange little girl.

"The third season brings strange power fluctuations that trigger Will's awareness of something otherworldly. Eleven and Max sense something is off about the town's residents, and despite having closed the portal to the Upside Down, fears that they are all still in danger from it." --Wikipedia.

It's been nearly a year since Will's strange disappearance, but life's hardly back to normal in Hawkins. Not even close.