Sky and HBO War Series: Cast, Plot, Release Date, and More

Sky and HBO present War, an eight-part legal drama series starring Sienna Miller and Dominic West in career-defining roles. The television landscape constantly evolves, but few projects capture the specific tension of high-net-worth matrimonial disputes quite like this gripping international collaboration.

Introduction to War, the New Sky and HBO Legal Drama

Sky and HBO present War, an eight-part legal drama series starring Sienna Miller and Dominic West. The series follows a high-profile married couple navigating a bitter, high-stakes divorce in London. George Kay, known for creating Hijack and Lupin, serves as the writer, creator, and executive producer. The narrative pits two elite London law firms against one another in a relentless court battle.

The eight-episode first season premieres on October 1, 2026, on HBO in the United States and October 2, 2026, on Sky in the United Kingdom. International distribution spans multiple regions, including Australia, France, Belgium, Italy, Germany, Switzerland, and Austria. New Pictures, a Banijay company, and Observatory Pictures produce the series in association with Sky and HBO.

Premise and Plot of War Season 1

The High-Stakes Divorce

The narrative centers on tech mogul Morgan Henderson, played by Dominic West, and his movie star wife Carla Duval, played by Sienna Miller. Their marriage disintegrates after Carla discovers her husband’s infidelity. Seeking fair compensation, Carla attempts to invalidate their prenuptial agreement.

Every legal maneuver mirrors the personal betrayal inside the marriage. Ambition functions as currency, and legal strategy masks personal vengeance. The legal dispute escalates rapidly as private secrets bleed into public courtrooms.

Challenging the Prenup

Carla attempts to invalidate their prenuptial agreement, arguing she generated the primary income during the early stages of their relationship. Two fictional City law firms represent the estranged couple. Taylor and Byrne represents Carla Duval, while Cathcarts and Sons represents Morgan Henderson.

The financial stakes involve hundreds of millions of dollars in shared assets, venture capital holdings, and global real estate portfolios. Neither party intends to concede a single pound or share.

Inspiration Behind the Series

Creator George Kay developed the premise after overhearing a glamorous woman in her fifties celebrating loudly over the telephone outside a queue. The woman announced that her wealthy husband finally signed divorce papers after four years of litigation. Kay decided to use a high-net-worth divorce as a lens to explore the intersection of personal relationships and professional ambition.

This chance encounter translated into a deeply researched screenplay that examines the emotional cost of winning a legal war while losing everything else.

The Star-Studded Cast and Characters

The Litigants

Sienna Miller stars as Carla Duval, an international film star challenging her prenuptial agreement. Dominic West stars as Morgan Henderson, a wealthy tech entrepreneur defending his assets. Their palpable onscreen chemistry drives the emotional intensity of the bitter courtroom battles.

Both actors bring immense gravity to roles that demand vulnerability, calculated cruelty, and absolute resolve under intense media scrutiny.

Taylor and Byrne Law Firm

Phoebe Fox plays Serena Byrne, a partner at Taylor and Byrne. James McArdle plays Nicholas Taylor, co-founder of Taylor and Byrne and partner to Serena in life and business. This dynamic duo represents the modern, agile force taking on the old guard.

Their personal relationship adds professional complications as they manage the pressures of a high-profile client who demands total victory.

Cathcarts and Sons Law Firm

Nina Sosanya plays Beatrice Queen Bea Ubosi, a formidable senior lawyer at Cathcarts and Sons. Pip Torrens plays St John Smallwood, her seasoned counterpart at Cathcarts. These seasoned veterans command the courtroom with intimidating precision and institutional backing.

They utilize every procedural loophole available to protect their billionaire client from financial exposure.

Expanded Ensemble and Rising Stars

Archie Renaux plays Jonathan Johnny Warren, an ambitious young lawyer caught in the relentless corporate machine. The expanded ensemble includes Celia Imrie, Nick Mohammed, Emma Laird, Aran Murphy, Archie Panjabi, Adrian Scarborough, Shaheen Jafargholi, Akiya Henry, Honor Swinton Byrne, Miles Jupp, Kartanya Maynard, Alexandra Mardell, Dylan Edwards, Mark Quartley, and Steve Furst.

This massive ensemble populates busy corporate offices, judges chambers, and press-lined street corners where the battle plays out.

Elite London Law Firms in Battle

Taylor and Byrne

Taylor and Byrne represents the modern, hungry, and ambitious firm with fewer traditional resources but exceptional tactical agility. They outthink their opponents by leveraging modern communication channels and aggressive public relations strategies.

The firm operates with a chip on its shoulder, making them dangerous adversaries for established institutional giants.

Cathcarts and Sons

Cathcarts and Sons represents the older, establishment firm wielding immense historical power and deep pockets. Their oak-paneled boardrooms have dictated London legal precedent for over a century.

They rely on exhaustive legal precedent, elite political connections, and an army of associates to overwhelm opposing counsel.

Production Team and Creative Direction

George Kay leads the creative vision as writer and executive producer. Ben Taylor serves as the lead director, while Laurie Borg acts as series producer. Willow Grylls and Matt Sandford executive produce for New Pictures.

Susan Breen, Ben Taylor, Andrea Dewsbury, and Megan Spanjian executive produce for Sky. Production companies New Pictures and Observatory Pictures designed the series to feel unapologetically affluent and grounded in character-driven drama.

Season 2 Renewal and Anthology Future

Sky and HBO confirmed a second season before the premiere of Season 1. The anthology-style structure allows the core group of lawyers to return while tackling entirely new clients and cases.

Season 2 shifts away from family law to focus on a major defamation suit. High-profile guest stars Marisa Tomei, Kelly Macdonald, and David Harewood will star as the litigants in the upcoming legal battle across different affluent industries.

Global Release Schedule and Streaming Platforms

United States Broadcast

The eight-part first season of War rolls out weekly across global platforms. In the United States, the series premieres on October 1, 2026, on HBO and streams on Max.

American viewers can access new episodes weekly through standard cable packages or standalone streaming subscriptions.

United Kingdom Broadcast

In the United Kingdom, the series premieres on October 2, 2026, on Sky and streams on NOW. British audiences receive access immediately following the US rollout.

Subscribers can watch live broadcasts or catch up on demand across compatible smart devices.

International Distribution

International markets air the series across Ireland, Italy, Germany, Switzerland, Austria, Australia, Asia, France, and Belgium via local broadcasting partners and streaming platforms. NBCUniversal Global TV Distribution manages international sales.

This coordinated global rollout ensures that audiences worldwide can experience the legal drama simultaneously without major regional spoilers.

Frequently Asked Questions

What is the exact release date for War on HBO and Sky?

War premieres on October 1, 2026, on HBO in the United States and on October 2, 2026, on Sky in the United Kingdom.

Who are the main cast members starring in War?

Sienna Miller and Dominic West star as the central divorcing couple, supported by an ensemble featuring Phoebe Fox, James McArdle, and Nina Sosanya.

How many episodes are in the first season?

The first season of the legal drama consists of eight compelling episodes.

Will there be a second season of War?

Sky and HBO renewed the series for a second season prior to the official premiere of Season 1.