Silo showrunner Graham Yost can sum up the fourth and final season in two words: "It's war."The upcoming season, set for a July 9, 2027 release, picks up in the wake of Season 3's twisty finale, which took viewers inside Silo 1. There, we discovered survivors from the show's past timeline, who are cryogenically frozen and periodically reawakened to serve shifts controlling the other silos. Among them are Daniel Keene (Ashley Zukerman) and his sister Charlotte (Jessica Brown Findlay), whose memories have been erased and who have been renamed Troy and Susan.

Troy butts heads with Juliette Nichols (Rebecca Ferguson) at the end of Season 3, in a sequence that merges the show's timelines and sets the stage for a showdown between Silo 18 and Silo 1, and between Juliette and Daniel. According to Yost, that means we'll be getting more of Juliette on the warpath.

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"[This season] Juliette has come from not knowing who she was to saying, 'We have to take on Silo 1.' That's Juliette. That is the full return of Juliette. In Season 4, we are full-on Juliette from the first frame of the season to essentially the final one," Yost told Mashable.

On top of Juliette's full return, Silo Season 4 is also going to be showing more of the inner workings of Silo 1."Certain characters we've spent some time with really move up into the fore," Yost said of the new focus on Silo 1.