'Stranger Things' season 2 news, spoilers: David Harbour teases 'bigger' and 'darker' plot; series wins big at 2017 SAG Awards

"Stranger Things" is set to feature a new threat when season 2 premieres this year.

Dubbed as Netflix's summer hit of 2016, "Stranger Things" quickly rose to popularity because of its gripping storyline and 1980s-inspired sci-fi horror theme. Season 1 left off with a cliffhanger about Eleven's (Millie Bobby Brown) fate, making fans more excited to see what happens next to the rest of the characters. Will (Noah Schnapps) also appeared to be throwing up slugs in the finale, which hints that a creature from the upside down was growing inside him.

Star David Harbor attended the Fan2Sea Comic-Con cruise, and while he didn't spill a lot of details, he revealed that season 2 will have a darker storyline. "Season 2 is bigger and potentially darker in its stakes," he teased. Harbour went on to share that the threat to Will "has grown," but the plot will keep true to the magical storytelling that was laid out in season 1.

The premiere picks up a year later, and the show will continue to be character-based. Season 2 will see the return of familiar faces, as well as the arrival of new characters including Sean Astin, Paul Reiser, and newcomer Linnea Berthelsen.

"Stranger Things" won big at Sunday's SAG Awards, and Harbour took the opportunity to use his moment in the spotlight to deliver a politically-charged speech. Harbour, who plays Chief Jim Hopper on the sci-fi drama, spoke on behalf of the cast as they accept their award for best ensemble in a drama series.

"In light of all that's going on in the world today, it's difficult to celebrate the already celebrated Stranger Things. Great acting can change the world. We call to arms our fellow craftsmen and women to go deeper and through our hearts battle against fear, self-centeredness, exclusivity of our predominantly narcissistic culture," he said. "As we act in the continuing narrative of Stranger Things, we 1983 midwesterners will repel bullies, we will shelter freaks and outcasts, those who have no hope. We will get past the lies," he went on to say.

Netflix has yet to announce an official premiere date for "Stranger Things" season 2.