‘Silo’ Adds Jessica Henwick & Ashley Zukerman as Series Regulars: All the Details on Season 3

Kelli Boyle January 17, 2025, 11:25 am

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Jessica Henwick, Ashley Zukerman — Jeff Spicer / Theo Wargo / Getty Images

[Warning: The following contains MAJOR spoilers for the Silo Season 2 finale, “Into the Fire.”]

Did you check out Silo during Apple TV+‘s free weekend (January 4-5)? If not, and if you love sci-fi, this book adaptation starring Dune‘s Rebecca Ferguson is one to put on your watch list.

The Season 2 finale came out on Friday, January 17 on the streamer, and it featured the debut of two new characters who will reportedly play important roles in Season 3. With a renewal for Seasons 3 and 4 already green-lit (Season 4 will be the last), let’s look at what’s to come, from the books the next two seasons will be based on to the latest casting announcements.

What is Silo about?

Sara Hazemi and Rebecca Ferguson in the ‘Silo’ Season 2 finale (Apple TV+)

Based on Hugh Howey’s New York Times bestselling trilogy of dystopian novels, Silo is the story of the last 10,000 people on Earth, their mile-deep home protecting them from the toxic and deadly world outside. However, no one knows when or why the silo was built and any who try to find out face fatal consequences. Ferguson stars as Juliette, an engineer, who seeks answers about a loved one’s murder and tumbles onto a mystery that goes far deeper than she could have ever imagined, leading her to discover that if the lies don’t kill you, the truth will.

Season 2 saw Juliette venturing out into the dangerous unknown, and the leaders of the silo community are lying to the people saying that she died on this mission. There are skeptics in the underground who don’t trust what they’re being told by those in charge.

When does the Silo finale come out?

Silo Season 2 came to a close on Friday, January 17. The finale was the season’s 10th episode.

Who is in the Silo cast?

The Silo Season 2 finale introduced two new characters, and Variety reports that they will be back in Season 3. Jessica Henwick and Ashley Zukerman will be series regulars in Season 3 when they return as Helen and Daniel, respectively. Helen is described as a “whip-smart reporter.” Daniel is described as a “young and hungry congressman.”

In addition to Ferguson, the Apple TV+ series also stars Tim Robbins, Common, Harriet Walter, Chinaza Uche, Avi Nash, Shane McRae, Steve Zahn, Alexandria Riley, Remmie Milner, Clare Perkins, Billy Postlethwaite, Rick Gomez, Caitlin Zoz, Tanya Moodie, Iain Glen, Angela Yeoh, and Sara Hazemi. David Oyelowo also starred in five episodes in Season 1.

Is Silo renewed or canceled?

Remmie Milner and Shane McRae in ‘Silo’ Season 2 finale (Apple TV+)

Apple TV+ renewed Silo for Seasons 3 and 4 on December 16. Season 4 will be the final season. The show’s creators (which includes Ferguson as an executive producer) have said that they’re not interested in extending the show’s plot beyond what happens in Howey’s trilogy. The plot of the three books will be stretched across the four total seasons.

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Yost told GamesRadar+ that “the books are a trilogy. This is not Outlander. This is not a long science fiction series. It’s a trilogy. We’re not going to extend it beyond that.” Upon its renewal, Yost said he looks forward to creating Silo‘s “incredibly satisfying conclusion.”

“It has been a richly rewarding experience to adapt Hugh’s epic novels with our partners at Apple, and we are thrilled to have the opportunity to bring this complete story to the screen over the course of four seasons,” Yost said in a statement on December 16. “With the final two chapters of Silo, we can’t wait to give fans of the show an incredibly satisfying conclusion to the many mysteries and unanswered questions contained within the walls of these silos.”

What will happen in Silo Season 3? What book is it based on?

[Warning: Book spoilers ahead!] The three books in Howey’s trilogy are titled Wool, Shift, and Dust (in that order). Seasons 1 and 2 cover the plot of Wool, and Seasons 3 and 4 will adapt Shift and Dust. Howey serves as an executive producer on the show. Wool first came out in 2011, followed by Shift in January 2013 and Dust quickly after in August 2013.

Book readers know that there’s a major timeline shift in the second novel that temporarily changes Juliette’s presence in the story. Showrunner Graham Yost told TVLine that they’re not going to bench Ferguson in Season 3. He also said to expect a “surprise” ending in the Season 2 finale, one that will seemingly be a departure from the source material. This could potentially set up Ferguson’s continued presence next season.

Steve Zahn and Rebecca Ferguson in the ‘Silo’ Season 2 finale

Season 2 ends “in a slightly different way” than Wool, Yost said. “There’s a big surprise at the end of the season — and that’s all I’ll say.”

Shift is mostly a prequel story for Wool and is set 300 years before the events of the first book. Juliette is largely absent until the end because of this, but Silo will seemingly change course.

“In the book Shift, Juliette doesn’t appear until like the last page, right? It’s about this silo [No. 18], but it’s also the origin story of the whole silo project,” Yost told TVLine. “I would say that we have Rebecca Ferguson playing Juliette, and she is not just going to be in the last scene of the season. Juliette would be a big part [of Season 3].”

When does Silo Season 3 come out?

It’s too early to have an exact release date, but expect at least a year before Season 3 debuts. Season 1 came out in May 2023, followed by a November 2024 release for Season 2. Ferguson said she believes they’ll be filming the last two seasons back to back, however, so there could be a shorter wait between those.

Prior to the show’s renewal, Ferguson told Collider, “I believe that the show has an ending, and I know when that is. So that’s the answer. You will find out when the show is done. To be honest, I don’t think it’s a secret. The books are the books. It’s three books, and the three books are divided into four seasons,” she said, adding, “So I believe, unless any Apple person is gonna jump on, I think we’re absolutely fine with saying Season 1, we’ve done. Season 2 is shot and coming out, and we’re now looking at green-lighting Seasons 3 and 4. And I think we would film them maybe together, and that would be the end.”

Stay tuned here as we continue to report the latest updates.

Silo, Seasons 1-2 Available Now, Apple TV+