from EW
"Stranger Things really sets its ’80s sci-fi/Stephen King vibe right off the bat. The series premiere opens on a laboratory isolated in the woods in Hawkins, Indiana, in 1983. A man in a lab coat runs down a dark hallway, frantically pushing buttons for the elevator. As the elevator arrives he seems to be safe, but as the doors are about to close something growls above him. He’s pulled up and we never see him again.
Meanwhile, four middle-schoolers, Michael, Dustin, Lucas, and Will, are playing a fantasy RPG in their basement. They want to play just a bit longer, but it’s time for them to go home Michael’s mom insists. That sends Will and Dustin biking home. They decide to race and, as Will pulls away, he finds his way into the same area as the laboratory and crashes his bike.
He hears something in the distance and scrambles home, but something’s still chasing him. He holes up in a shed in the backyard and loads a gun to fight off whatever’s coming for him, but it’s not enough. The lights flicker, a growl is heard, and Will disappears. That’s the setup for the rest of the series. Will Byers vanishes during a night of many power outages across Hawkins. His mother, Joyce (Winona Ryder), can’t find him the next morning, and neither can his older brother, Jonathan."