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Things in Hawkins are about to get a whole lot stranger.
Astin will play Bob Newby, "a kindhearted former nerd" who attended high school with Joyce Byers and Jim Hopper, and manages the local RadioShack.
EW also announced two other additions to the season 2 cast: Paul Reiser, who played the infamous Carter Burke in James Cameron's Aliens, and Danish actor Linnea Berthelsen.
Reiser is cast as Dr. Owens, "a high-ranking member within the Department of Energy on a 'clean-up' assignment, tasked with containing the events of last year."
Berthelsen is cast as the Eleven-esque character Roman, an "emotionally damaged, magnetic young woman who suffered a great loss as a child," and is somehow "mysteriously connected to the supernatural events at the lab."
The announced cast joins two other new characters for the upcoming season: Max, a teenager portrayed by Sadie Sink; Billy, Max's older step-brother, who is played by Dacre Montgomery.
So what role will Newby's RadioShack play into season two? Will Astin's character give the team a set of newfangled Walkie-talkies? Perhaps he'll provide his former friend Joyce with some spare Christmas lightbulb replacements? Until the series premieres in 2017, the fan theories are endless.