Silo season 3 cast revealed: meet every new character and who plays them

If you’ve spent the last few years shouting 'Who built the flippin’ silos?' at your telly, here’s some good news: Silo is back for Season 3 on Apple TV, and this time they’re finally having a proper go at answering the big questions. We’re now deep enough that we’re getting as much 'Before Times' as Silo proper, with conspiracies spanning from nuclear paranoia to memory pills in the mushroom soup. Frankly, it’s a lot for anyone to keep track of—so here’s the full low-down, crisply untangled.

Season 3 – Time Jumps, Memory Loss, and a New Set of Faces

The premiere dropped on 3 July 2026, and, true to form, wastes no time wrecking your sense of continuity. Juliette is back inside Silo 18, except she’s mayor now, can’t remember her past, and is being drugged by her supposed friends. Meanwhile, in a freshly-dramatised timeline set a few centuries earlier, we’re following the group who actually designed the silos. It’s two timelines, about twelve agendas, and quite a lot of confusion if you’re not paying attention.

Main Cast—Returnees from the Deep

• Rebecca Ferguson as Juliette Nichols: She started out fixing generators, became sheriff, survived the outside, and now it’s mayor time—with a catch. She’s lost most of her memory, doesn’t recognise people she trusts, can’t crack why she avoids the mushroom soup, and is oblivious to the fact Camille is slipping her mind-wiping pills. Juliette’s journey this season is all about reassembling her own story, while the entire council gaslights her for fun.
• Common as Robert Sims: Sims, previously the muscle for Bernard, is now a Judge at the top of Silo 18’s food chain (with his wife, Camille, right next to him). In episode one, it’s confirmed he snuffed out Bernard himself after last season’s inferno—and he’s been telling everyone it was just fire and poison that got him. Now Sims is out front acting the progressive, reforming leader, when in reality he’s consolidating control for his family’s own safety. Common plays it like a man who still thinks he’s doing good, even while he’s running the entire place by fear and lies.
• Steve Zahn as Jimmy Conroy/Solo: The only person from Silo 17 who survived its total collapse, Solo’s encyclopaedic knowledge of Safeguard Procedure (and how not to die in a toxic air event) isn’t just handy, it’s essential. With Juliette not remembering her discoveries, Solo’s information is now the bedrock for any chance at figuring out what's really going on.
• Alexandria Riley as Camille Sims: Once just seen as ‘the wife,’ Camille now quietly orchestrates half the drama in Silo 18. She’s the one medicating Juliette, rewriting history, and covertly messaging The Algorithm. Riley has given Camille a nurse’s bedside manner over a core of pure cunning—the kind of performance that makes you nervous for whoever sits on the other sofa.

The Newcomers: Silo 3's Expanding Universe

In the sprawling 'Before Times' thread, we meet a fresh pack of movers, shakers, and future doomsday architects. Here’s the lot:

• Jessica Henwick as Helen Drew: She’s the investigative journalist who, at the end of last season, was giving Congressman Daniel Keene a grilling over a dirty bomb attack that some very shady government types are pinning on Iran. In the books her part is more blink-and-miss-it, but the showrunners clearly wanted more, so she’s a lead now—lots of scenes sparring with Zukerman’s Congressman, which gives the historical bits some actual heartbeat.
• Ashley Zukerman as Daniel Keene: Your classic politician with an engineering degree and a tragic home life. He’s angling for a seat on the Iran Committee (which his sister, a Navy pilot, also wanted him to join). The show skipped the novel’s Donald and pasted Zukerman on the arc instead—he ends up a central player in the events leading straight to the building of the silos.
• Jessica Brown Findlay as Charlotte Keene: Daniel’s sister, Navy pilot, and the unlucky sod who gets brain damage after her plane hits some extremely suspicious cloud formation during a strike on Iran. When Daniel finds her, she’s alive but wiped clean—no memory of who he is. Findlay plays her with all the paranoia and desperation you’d expect; it’s almost uncomfortable to watch.
• Laura Innes as Senator Thurman: She chairs the Iran Committee, which Daniel is so desperate to worm his way into, mainly for family reasons. Thurman’s a step or five ahead of every conversation—the sort of operator who probably knows what day the world ends before the rest of us do.
• Colin Hanks as Per Stensen: Think sinister Elon Musk—with more money. Hanks is circling Daniel from the first episode, likely for his engineering expertise. It’s a safe bet he’ll be critical to the events that end with humanity moving underground.
• Reed Birney as Erskine: Erskine is one of the core leaders behind the top-secret CAD-FAC programme—the blueprint for everything the silos become. Alongside Matt Craven’s Victor, he’s operating at a higher pay grade than Daniel is even aware exists.
• Matt Craven as Victor: Victor is Erskine’s right hand and shares responsibility for CAD-FAC’s day-to-day. Craven leans into his usual hard-nosed authority type here—the implication being he’s one of the handful who actually okayed the move below ground.
• Morven Christie as Anna: Anna, Thurman’s daughter, is actively feeding Daniel information about his sister’s whereabouts through her JSOC contacts. Also his ex, because of course she is. It’s a bit of a classic TV move: she’s at the intersection of political conspiracy and domestic drama.
• Ned Dennehy as Ed Harwood: Silo 18’s Head of Mining, and probably the most honest man in the silo. He puts the council straight: last week’s tunnel collapse wasn’t sabotage, it was just too many years digging in circles. He’s clued-in that the tunnels, while endless, won’t take them outside, and he knows exactly how old the place is.
• Chris Fulton as Mike: Not a lot is known yet about Mike, except he’s in the new episodes as a guest. Details are deliberately thin, so expect a plot twist or two.

Who Else Is Back?

The supporting cast from previous seasons—if they survived past finale—are cropping up in varying levels of authority and anxiety, muddling through Silo 3’s shifting power structures and a mounting body count. It’s a much wider canvas this time, and there’s plenty of room for old faces to pop back up just when you’d thought they’d finally got a break.

Silo Season 3 is now streaming on Apple TV.