The main cast for Stranger Things was just announced/confirmed recently, with two new cast members getting added almost a month ago, but these additions are on par with getting Winona Ryder for Season 1.
He went to high school with Joyce and Hopper, and they probably knew him as quite a bit of a nerd, but a nice one all the same.
Sean Astin, whose career is filled with genre entries like The Goonies, Lord of the Rings and The Strain, will play the local RadioShack manager Bob Newby.
If RadioShack is getting namechecked here, expect more spooky electronics in Season 2.