Line Of Duty is officially gearing up for a dramatic return — and this time, it’s bringing with it a star-studded wave of familiar faces that fans won’t be able to ignore.
Ahead of its highly anticipated seventh series, the BBC has finally lifted the lid on a major casting update, confirming an exciting mix of new and returning talent set to shake up the iconic crime drama.
The Jed Mercurio hit — which is expected to land on BBC One and iPlayer in 2027 — will begin filming this spring, marking a long-awaited comeback for one of the UK’s most talked-about series.
At the heart of it all, the beloved trio Martin Compston, Vicky McClure and Adrian Dunbar will reprise their roles, bringing AC-12’s legacy back into the spotlight once more.
But it’s the influx of new characters that is already causing a stir.
Sanditon star Tom Weston-Jones is set to take on a central role as Detective Inspector Dominic Gough, the commanding officer of a brand-new unit — Tactical Operations Unit 7 (TO-7). His character is described as a decorated and charismatic officer, praised for dismantling organised crime networks — but with a dark twist, as he faces allegations of abusing his authority in deeply troubling ways.
The cast expansion doesn’t stop there. Viewers can also expect appearances from Killing Eve’s Dominic Mafham, Rivals actor David Calder, Sarah Andre White, Naomi Yang, and Aimee Powell — adding even more depth to an already powerful ensemble.
Meanwhile, familiar faces from previous series — Mark Bonnar, Owen Teale, Perry Fitzpatrick and Christina Chong — are also set to return, reinforcing the show’s connection to its gripping past.
In a move that has particularly excited fans, BAFTA-winning star Robert Carlyle has been confirmed for a guest role as Detective Constable Shaun Massie. Known for his commanding screen presence, Carlyle follows in the footsteps of previous guest stars such as Kelly Macdonald, Stephen Graham and Thandiwe Newton.
Speaking about his involvement, Robert shared his enthusiasm: he revealed he has long admired Jed Mercurio’s work and described the scripts for series seven as maintaining the high standard audiences expect. He also hinted that his character, DC Massie, is far from ordinary — promising a performance that will leave viewers hooked.
Jed Mercurio himself expressed his excitement, calling Carlyle’s casting a “career highlight” and praising his ability to bring intensity and depth to every role — something he believes will keep audiences guessing throughout the new series.
BBC drama director Lindsay Salt echoed the sentiment, describing Carlyle as the “perfect fit” for the Line Of Duty universe.
As for the storyline, series seven will follow a major shift in the show’s structure. The once-feared AC-12 unit has now been disbanded and rebranded as the Inspectorate of Police Standards — but the fight against corruption is far from over.
Steve Arnott, Kate Fleming and Ted Hastings will find themselves tackling one of their most sensitive and complex cases yet.
At the centre of the drama is DC Shaun Massie, a specialist rifle officer working within TO-7. A skilled but solitary figure, Massie’s world begins to unravel when his superior, DI Gough, becomes the subject of serious allegations — forcing him out of the shadows and into a moral and professional crisis.
Adding another layer of intrigue, reports suggest the long-running mystery surrounding the elusive criminal mastermind known as ‘H’ could be reignited.
Fans will remember the divisive ending of series six in 2021, when Ian Buckells was revealed as ‘H’ — a twist that left many viewers dissatisfied. Now, insiders claim the new series could revisit that storyline, potentially delivering the answers audiences have been waiting for.
According to a TV source, there was significant backlash following the previous finale — one of the key reasons a seventh series was commissioned. This time, the show is expected to strike a balance between introducing a new villain and revisiting unresolved threads, creating a layered and high-stakes narrative.
Since its debut in 2012, Line Of Duty has remained a ratings powerhouse, regularly attracting over 10 million viewers and cementing its place as one of Britain’s most gripping dramas.
In a statement, Jed Mercurio thanked fans for their loyalty, acknowledging the journey across six seasons and expressing excitement about returning for another chapter.
Martin Compston also reflected on the show’s impact, calling it “a job of a lifetime” — not just for its success, but for the lasting friendships formed behind the scenes.
Vicky McClure added that she is thrilled to be back, teasing an emotional and exciting reunion with the cast and crew.
And for fans wondering why now — Martin revealed the decision came after a moment of reflection among the team, who felt the time was right to return before the opportunity slipped away.
Line Of Duty series one through six are currently available to stream on BBC iPlayer.
