Watch Online: Betrayal (2026)

Betrayal (2026): A Gripping MI5 Thriller Coming to ITV1

Get ready for an intense exploration of loyalty, duty, and compromise. Betrayal is an upcoming British crime-mystery series that promises to deliver psychological depth alongside pulse-pounding espionage drama. Starring acclaimed actors Shaun Evans and Romola Garai, this ITV1 original follows a veteran intelligence officer navigating the moral complexities of modern security work. If you're eager to watch this series online when it premieres, here's everything you need to know about the release date, cast, episodes, and where to find it.

Plot Summary: When Duty Meets Disillusionment

John Hughes spent his career at the forefront of MI5's fight against terrorism, protecting British lives during the most dangerous years of the post-9/11 era. Now in his mid-40s, Hughes is a seasoned veteran with a family he's fought hard to protect. But in today's intelligence landscape, the old rules no longer apply. Forced to adapt to a modernized, progressive MI5 workplace culture while facing evolving threats to national security, Hughes finds himself caught between the operative he once was and the professional he must now become. As traditional methods clash with contemporary values, Hughes will be tested in ways that extend far beyond the battlefield.

Betrayal Release Date & Episode Guide

Betrayal is set to premiere on February 8, 2026 on ITV1. The series consists of 4 episodes making up its inaugural season. This is listed as a returning series, suggesting the creators have plans for the story to continue beyond the first season—good news for viewers who become invested in Hughes's journey.

Full Cast & Starring Actors

The series features powerhouse performances from Shaun Evans and Romola Garai, two of the UK's most respected dramatic actors. Evans brings complexity and world-weary authenticity to leading roles, while Garai is known for her ability to portray nuanced, intelligent characters. Their screen chemistry and individual talents should make Betrayal a compelling watch.

Behind the Scenes: Creative Team & Production

• Creators & Directors: Damien Timmer, Tom Leggett, Polly Hill
• Network: ITV1
• Production Company: Mammoth Screen
• Country of Origin: United Kingdom

The series is produced by Mammoth Screen, a studio known for creating high-quality British dramas. With experienced creators like Damien Timmer leading the project, audiences can expect the cinematic production values and narrative sophistication that have become hallmarks of modern British television.

Genre, Rating & Series Details

• Genre: Crime, Mystery
• Series Type: Television Drama Series
• IMDb Rating: 7.6/10
• Status: Returning Series

Where to Watch Betrayal Online

Streaming availability and watch options will be confirmed as the February 2026 premiere date approaches. Be sure to check back on this page for updates on how to stream Betrayal legally through official channels. Bookmark this page now to stay informed about streaming platforms, release windows, and viewing options as they're announced.

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