It wasn't the show.
Summer, 1985. Hawkins, Indiana.
"Hello, little Henderson," the thing said through Mike's mouth. "You think the gate is closed? I'm not in the Upside Down anymore. I'm in the signal . And you just invited me into 1985." Stranger.Things.S03.COMPLETE.1080p.NF.WEB-DL.DD...
The screen flickered to life.