The Twelve is back for season 3, with Sam Neill returning as formidable defence barrister Brett Colby SC.
Titled The Twelve: Cape Rock Killer, the new eight-part season sees Colby pulled into a deeply personal case when he is asked to defend the husband of a lifelong friend, who has been accused of a shocking murder.
As the trial unfolds, it also reopens a mystery from the past, with a 1968 cold case involving the murder of two teenagers coming back into focus.
As ever, the series also follows the 12 jurors selected for the case, whose own histories, secrets and biases shape how they respond to the evidence in court.
The Twelve season 3 features a largely new cast alongside Neill, with Wentworth star Danielle Cormack joining the series, as well as Eryn Jean Norvill, Sarah Peirse and William Zappa.
Here’s everything you need to know about The Twelve: Cape Rock Killer.
The Twelve season 3: Cape Rock Killer release date
The Twelve: Cape Rock Killer will be available to stream as a full box set on ITVX from Sunday 31 May 2026.
The first two episodes are also set to air on ITV1 on Sunday 31 May 2026 from 10:45pm.
The season previously premiered in Australia on BINGE and Foxtel’s Showcase on Monday 4 August 2025, with episodes released weekly.
The Twelve season 3: Cape Rock Killer cast
Sam Neill returns once again as Brett Colby SC, the defence barrister who has served as the main link between each season of The Twelve.
Season 3 also stars Danielle Cormack as Gabe Nicholls, with Eryn Jean Norvill, Sarah Peirse and William Zappa among the new key cast members.
The confirmed cast for The Twelve season 3: Cape Rock Killer includes:
- Sam Neill as Brett Colby SC
- Danielle Cormack as Gabe Nicholls
- Eryn Jean Norvill as Amanda Taylor
- Sarah Peirse as Beth Chaplin
- William Zappa as Alan Chaplin
- Ewen Leslie as Andrew Retsis
- Phoenix Raei as Bassam Aziz
- Nathalie Morris as Jazmyn Tanner
- Bessie Holland as Camilla Jones
- Paul Tassone as Blake Gibson
Also among the cast are: Hanah Tayeb, Catherine Moore, Bolude Watson, Stuart Daulman, Charles Napoleon An, Libby Stone and Claire Leach.
Speaking when the cast was announced, Neill said: “Well, here we go again! Delighted to be stepping back into Colby’s shoes, and a privilege to join this brilliant bunch of actors.
“Hats off to Sarah Walker, who’s spun another cracking story full of secrets, twists, and some rather inconvenient truths. It’s all gripping stuff, I promise.”
Cormack added: “As a fan of previous seasons, joining my fellow Kiwi Sam Neill and the enormous ensemble cast on this anthology series has been a joy.
“It’s been such a privilege to work on a local drama that is gripping, full of intrigue and features wonderfully drawn characters. The direction and crew of this season has been outstanding, and I’ve relished going head-to-head with Sam in the courtroom.”
What is The Twelve season 3: Cape Rock Killer about?
The Twelve: Cape Rock Killer sees things get personal for Brett Colby, who is thrust into a murder trial involving the husband of a lifelong friend.
The accused stands charged with a horrific murder, but as the case plays out in court, it begins to expose a much deeper mystery.
The trial also reopens a 1968 cold case involving the murder of two teenagers, while the 12 jurors sworn in for the case find their own lives changed by the experience.
The official synopsis teases: “The Twelve: Cape Rock Killer is unlike any other as things get personal for Brett Colby (Sam Neill) after he is thrust into a murder trial to defend the husband of a lifelong friend accused of a heinous murder.
“As the trial unravels a deeper mystery, a 1968 cold case murder of two teens is re-opened, and the twelve jurors sworn in for the trial find their own lives changed by the experience.”
The season was filmed in Western Australia, including Perth and the Margaret River region.
Is there a trailer for The Twelve season 3: Cape Rock Killer?
Yes, a trailer has been released for The Twelve season 3: Cape Rock Killer.
The tense footage shows Brett Colby returning to court for another complex case, while also teasing the decades-old mystery at the heart of the new season.
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The Twelve season 3: Cape Rock Killer – what is the drama based on?
The Twelve is based on the Belgian series De Twaalf, created by Bert Van Dael and Sanne Nuyens.
The original Belgian drama focused on 12 jurors who are selected for a murder trial, with the show exploring how their own lives and experiences influence the way they view the case.
The Australian version began with a similar premise, but has since evolved into an anthology, with each season following a new trial and new set of jurors, while Sam Neill’s Brett Colby SC remains the connecting thread.
Season 3, Cape Rock Killer, continues that anthology approach with a fresh murder trial and a new mystery dating back to the 1960s.
The Twelve: Cape Rock Killer will be available to stream on ITVX from Sunday 31 May 2026.
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