In July last year, Netflix broke ground with the Duffer Brothers' "Stranger Things," the 80s-themed science fiction suspense series that captured the hearts and minds of viewers all over the world.

That same series launched the career of Millie Bobby Brown, who played the enigmatic Eleven on the show, which also starred familiar faces such as Winona Ryder and David Harbour and a slew of other newcomers.

This October, the series will return with its sophomore series, picking up a year after the events of last season's finale. While "Stranger Things" Season 2 is set to answer the questions it left last year, it's also set to end with a new cliffhanger, as per star Gaten Matarazzo.

Gaten Matarazzo promises 'exciting' cliffhanger

The Duffer Brothers'-created the science fiction suspense series that revolved around a band of brothers in the form of Mike Wheeler (Finn Wolfhard), Lucas Sinclair (Caleb McLaughlin), Dustin Henderson (Gaten Matarazzo), and of course, Will Byers (Noah Schnapp), who was abducted into the Upside Down in Season 1.

In "Stranger Things" season 2, Matarazzo promises another cliffhanger that will keep fans on the edge of their seat. He told The Huffington Post that while "a good amount of explanation that they’ve been looking for...there are some new stories coming in that you’re gonna want to hear about if there is a Season 3."

What is the Pollywog?

The stories that Gaten Matarazzo may be hinting at for "Stranger Things" season 2 may be the arrival of a new spider-like monster, which was featured in the first teaser for the show's sophomore season.

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Now that Will is coughing up slugs, does this mean he is connected to the evil that is Upside Down? Is the spider-like monster also a creature from the Upside Down? These are just some of the questions that need to be answered come October.

The episode titles of the next season have been revealed, and two of them are called "The Storm" and "The Pollywog." In the teaser video, the spider-like creature is seen walking through what looks like a storm. Is the spider-like creature called the Pollywog and what kind of storms is it bringing along with it?

Will's future as a possible villain

Earlier this month, executive producer and director Shawn Levy spoke to The Hollywood Reporter, hinting that Will will be more of a central character than he was in the previous season. In season 1, Will was mostly missing, and the plot revolved around looking for him.

In "Stranger Things" season 2, viewers will get to see the character be "very much at the center" of it, and "in the thick of the story." Noah Schnapp's theory is that Will has become some sort of "incubator" for some "baby Demogorgons," as he was seen coughing up slugs in the season finale last year.

Theories about Will turning evil have been around for some time, and fans will get to see if the character does go down that path when the sophomore season hits Netflix on October 31.