Blue Lights Season 3 cast and character guide: Who plays whom in the BBC One police procedural drama 

Blue Lights Season 3 is finally here, and fans of the gritty Belfast police drama are jumping with joy and excitement.

This season, once again brings together the street patrols, messy personal lives, and the constant question of who can survive the job. So who's putting on that uniform back again, and which new names are on their way to stir up some trouble in Belfast's underworld?

The cast features both older faces and some new ones, and here's a complete guide to the major cast members and their characters.

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Blue Lights Season 3 cast and character guide

Siân Brooke as Grace Ellis:

Grace Ellis remains the heart of Blue Lights Season 3. She was once a social worker, but she left that world to join the force, and it is this duality that makes her such an interesting character to watch.

She doesn't just identify people as criminals or victims, but she sees the people who they are underneath it all. The empathy that she has can be a strength, but it can also fog up judgment in this line of work. Siân Brooke's performance grounds Grace's performance with grit.

Grace still struggles with balancing her compassion against the unforgiving reality of Belfast policing, and Blue Lights Season 3 shows her evolving in ways fans wouldn't want to miss.

You might recognize Siân Brooke from: Sherlock & Good Omens.

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Martin McCann as Stevie Neil:

Every team needs a pillar to fall back on, and in Blue Lights Season 3, that pillar is Stevie Neil. Recently promoted to a sergeant, Stevie now had more responsibility than ever before, both at work and at home. His relationship with Grace adds another layer of intrigue and drama, as they juggle buying a house with the chaos of the job.

Martin McCann plays Stevie with the kind of strength that makes him feel believable as a man trying to do the right thing. His promotion also sets him up as a mentor figure to the other characters.

You might recognize Martin McCann from: Maze & Hostage.

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Nathan Braniff as Tommy Foster:

Tommy Foster continues to be the reliable force among the younger officers. Living with his girlfriend and colleague Annie, Tommy's personal and professional life is pretty entangled with each other.

Blue Lights Season 3 throws light on his loyalty and wit, both traits that make him an important part of patrolling. Nathan Braniff delivers Tommy with charm, never overplaying the part but letting his presence shine. Fans who have followed him from day one will notice how much he's matured.

You might recognize Nathan Braniff from: Paltrocast.

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Katherine Devlin as Annie Conlon:

Few characters have grown as sharp as Annie Conlon has. From a recruit to now a constable, Annie's journey has been molded by every dangerous twist and turn, and also by every loss.

Blue Lights Season 3 continues that growth as Katherine Devlin gives Annie an edge that feels authentic, and fans will find themselves rooting for Annie's continued growth in Belfast.

You might recognize Katherine Devlin from: The Dig.

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Andi Osho as Sandra Cliff:

Sandra Cliff stands as proof that not all strength is loud. Through every season, Sandra has grown into one of the most quietly powerful officers in the squad. In Blue Lights Season 3, she works more closely with Stevie, navigating his new role while carving out her own space in the team.

There's a sense she has more to give, and this season feels like the moment where she will.

You might recognize Andi Osho from: You & me and Curfew.

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Joanne Crawford as Helen McNally:

As an inspector, Helen McNally carries the responsibility of keeping the unit together. Her position forces her to make decisions that ripple across every officer's life. Blue Lights Season 3 complicates her role further when her old mentor, Colly, reappears with requests that test her loyalty.

Joanne Crawford, a seasoned actor, delivers Helen with quiet authority, showing us a leader who cannot afford to falter even when personal history clouds her judgment. McNally's arc adds a different texture to the season, proving that leadership in Belfast policing is never straightforward.

You might recognize Joanne Crawford from: Counsel & The Wise Guy.

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Cathy Tyson as Dana Morgan:

New this season is Dana Morgan, a character whose presence instantly reshapes the criminal underworld. She runs a private members club, The Deanery, but her true power lies in the hold she has over Belfast's drug trade.

Cathy Tyson's Dana has a commanding aura. In Blue Lights Season 3, she could be an alarming rival to law enforcement, with an easy influence spread far beyond the club's walls. Dana is not just another villain; she's a strategist, which makes her extremely dangerous.

You might recognize Cathy Tyson from Priest & The Rainbow.

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Michael Smiley as Paul "Colly" Collins:

Paul Collins, known as Colly, is another fresh face in Blue Lights Season 3. Once a mentor to Helen McNally, Colly now works in intelligence and resurfaces seeking her help on a case.

Michael Smiley plays him with a sharpness that instantly makes Colly feel like he belongs in this world. His history with Gerry Cliff, the fallen officer from Season 1, ties him back into the show's roots. Described as Dana Morgan's nemesis, Colly's role is sure to create tension.

You might recognize Michael Smiley from: Free Fire & Bad Sisters.

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Blue Lights Season 3 is fun to watch because of its characters. Each character carries a charm level of their own, shaping the show into something that feels real, lived-in, and at the same time unpredictable.

From Grace's battles to Dana's grip on Belfast, the cast makes sure that every storyline is filled with emotion and danger. Fans tuning in this season will be stepping back into a world where every choice has consequences, and every character matters.

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