According to TVLine, Sean Astin (Lord of the Rings) will be playing a high school friend of Joyce (Winona Ryder) and Sheriff Hopper's (David Harbour) and manages the local RadioShack.
Ross Duffer, series co-creator told the site that we'll see a different side of the actor and that he "killed it." Duffer said that Astin made the part so interesting and it made them write a better character. He added: "The few people who have seen [Season 2] are just raving about him."
A teaser trailer was released a few days back along with the release date for the second season being October 31st. A good way to spend Halloween.