'Stranger Things' season 2 spoilers: Will's nightmare & Barb's revenge

Stranger Things 2 — "Stranger Things" season 2 will begin streaming on Netflix on Oct. 31. YouTube/Netflix US & Canada

“Stranger Things” has done the seemingly impossible by teasing a trailer for its second season during the Super Bowl. But beyond that impressive feat, Netflix revealed some key details about the upcoming season, each of which opens up a world of possibilities.

The trailer, which can be watched below, seems to hint that Will Buyers (Noah Schnapp) has opened a portal to the Upside Down world. In season one of the series, audiences watched as he coughed up something that appeared to be a remnant of the other world. It is widely speculated that Will is being used by the monsters from the Upside Down to take over the world, beginning with Hawkins.

Another possibility, presented by Polygon, is that Will is just dreaming when the image of a red sky flashes before his eyes. It is also possible that he is simply hallucinating during that time. The shot is a little more mystical than normal, and the trailer also shows Will being examined by a doctor. It is not hard to believe that his parents would have requested some type of psychosis from doctors.

The “Stranger Things” season 2 trailer also confirms that Eleven (Millie Bobby Brown) is alive but not well. In the few seconds that Millie is onscreen, she is clutching her head while seated against the wall. There is no indication about whether or not she will reunite with her friends -- whom she seemingly sacrificed herself for in the first season -- but the Ghostbusters uniforms of the boys seem to hint that they will be looking for her.

But one thing that “Stranger Things” fans are collectively pointing out is that the teaser trailer does not show or mention Barb. The cast and executives of the show have said that there will be #JusticeForBarb, but the 30-second clip makes no show of this. That is if Barb is actually the monster that Will sees outside his front door.

Fans of the franchise have begun to speculate that Barb has turned into the large and multi-legged creature, and that it is her anger that inevitably pushed the change in persona. Barb that is hell-bent on getting back at all the people that teased her is a possible story, but the actual plot will have to wait for its revelation.

“Stranger Things” season 2 will be released on Netflix on Oct. 31. The first season is already available for streaming in its entirety.