Netflix has released the trailer for the fourth and penultimate season of popular sci-fi show Stranger Things.

The trailer sees Mike (Finn Wolfhard), Dustin (Gaten Matarazzo), Lucas (Caleb McLaughlin) and Max (Sadie Sink) enter high school, while Eleven (Millie Bobby Brown) and Will (Noah Schnapp) are in California. As the friends navigate their different surroundings, a new supernatural threat surfaces, forcing them to once again confront the horrors of the Upside Down.

“A war is coming. Your friends in Hawkins are very much in the eye of a storm,”

Eleven is warned.

“I don’t know how to say this other than just to say it — without you, we can’t win this war.” Cue the title cards: “Every ending has a beginning.”

On Feb. 17, series creators Matt and Ross Duffer announced that the fourth and penultimate season of “Stranger Things” will be split into two parts. Season 4, which will consist of nine episodes, has a runtime nearly twice the length of any previous season. The Duffers did not specify how many episodes would be included in each volume, or the average length of each episode. They also confirmed that the series has been renewed for a fifth season, which will be its last.

“Stranger Things” stars a large ensemble cast, with Brown, Harbour, Wolfhard, Matarazzo, McLaughlin, Sink, Schnapp all returning from previous seasons along with Winona Ryder, Joe Keery, Natalie Dyer, Charlie Heaton, Maya Hawke, Cara Buono, Priah Ferguson and Brett Gelman. Jamie Campbell Bower, Joseph Quinn and Eduardo Franco join the cast this season. The Duffers executive produce along with Shawn Levy, Dan Cohen, Cindy Holland, Brian Wright, Matt Thunell, Karl Gajdusek and Iain Paterson.

The first volume of “Stranger Things” Season 4 will be released May 27. The second part is set to follow on July 1.