Actors Sienna Miller and Dominic West lead the cast of War, an eight-episode legal drama series that premiered on HBO and began streaming on Max on October 1, 2026. Created by George Kay, known for his work on Lupin and Hijack, the anthology series follows high-profile individuals navigating bitter and public legal battles in London. The first season centers on a contentious high-stakes divorce, exploring the messy intersection of immense wealth, marital breakdown, and aggressive legal strategy.
The Plot of HBO’s Legal Drama War
The narrative of War kicks off when international film star Carla Duval (played by Sienna Miller) discovers a betrayal by her husband, tech billionaire Morgan Henderson (played by Dominic West). What starts as personal friction quickly escalates into an all-out legal war over money, assets, and reputation.
The series details the couple’s journey through mediation, arbitration, and ultimately a high-visibility trial. Rather than focusing solely on the emotional toll, the show dives deep into the tactical maneuvers deployed by opposing legal teams who stop at nothing to secure victory for their clients.
Meet the Cast and Rival Law Firms
At the core of the show are two fiercely competitive London law firms representing opposing sides of the divorce:
- Taylor & Byrne: An upstart firm representing Carla Duval. It is headed by married legal partners Nicholas Taylor (played by James McArdle) and Serena Byrne (played by Phoebe Fox).
- Cathcarts: A storied, established institution representing Morgan Henderson. This powerhouse team features seasoned lawyers St. John Smallwood (played by Pip Torrens) and Beatrice “Queen Bea” Ubosi (played by Nina Sosanya).
- The Undercover Insider: Archie Renaux stars as Johnny Warren, an ambitious junior lawyer acting as an undercover informant within the legal warfare.
The expansive supporting ensemble also features notable actors such as Celia Imrie, Nick Mohammed, Emma Laird, Aran Murphy, Archie Panjabi, Adrian Scarborough, and Miles Jupp.
Production Background and International Release
War is a co-production between New Pictures (a Banijay company) and Kay’s Observatory Pictures, developed in association with Sky and HBO. The series received a two-season commitment from its network backers before its official launch.
In the United States, the series airs on HBO and streams on Max. In the United Kingdom, Ireland, Italy, Germany, Switzerland, and Austria, the show broadcasts via Comcast’s Sky and streaming platforms NOW/Wow. International distribution is managed by NBCUniversal Global TV Distribution.
What Lies Ahead in Season 2
Operating as an anthology legal drama, War has already secured an early renewal for Season 2. While the first season focuses entirely on the explosive divorce battle between Henderson and Duval, the upcoming second season will shift its focus to an entirely new headline-making legal battle-an explosive defamation case. The second season’s lead cast will feature high-profile additions including Marisa Tomei, Kelly Macdonald, and David Harewood.
Frequently Asked Questions About HBO’s War
When did HBO’s War premiere?
Season 1 of War premiered on October 1, 2026, airing on HBO and streaming on Max in the United States, followed by its release on Sky and NOW in the United Kingdom.
Who created the series War?
The series was created by George Kay, widely recognized for creating hit television thrillers like Lupin and Hijack.
Which actors star in the main roles of Season 1?
Sienna Miller stars as international film star Carla Duval, and Dominic West plays her estranged husband, tech billionaire Morgan Henderson.
What is the premise of Season 1?
Season 1 follows the bitter, public, and highly strategic divorce battle between Carla and Morgan as two rival London law firms-Taylor & Byrne and Cathcarts-wage war over assets and reputation.
Has War been renewed for a second season?
Yes, HBO and Sky issued a two-season commitment for the show. Season 2 will shift its narrative focus to an intense defamation case led by a new cast featuring Marisa Tomei, Kelly Macdonald, and David Harewood.
