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The new season is set to be, once again, as topical and relevant, digging into "the professional apparatus alongside organised crime, and how paramilitaries in Belfast are often in thrall to international organised crime gangs using the territory as a stopping off point for large scale drug smuggling," according to series co-creator Declan Lawn.
He added: "It also looks at sexual exploitation of kids in care. These storylines are entirely fictional but informed by careful research so have a real authenticity."
This season sees a return of the central cast as well as newcomers like Dune: Prophecy's Cathy Tyson and Bad Sisters star Michael Smiley. But who's who in the new season?
Read on for everything you need to know about the cast of Blue Lights season 3.
Blue Lights season 3 cast
The confirmed cast for Blue Lights season 3 are as follows. Scroll on to find out more about their characters, plus scroll further for information on previous season's characters.
- Siân Brooke as Grace Ellis
- Katherine Devlin as Annie Conlon
- Nathan Braniff as Tommy Foster
- Martin McCann as Stevie Neil
- Joanne Crawford as Helen McNally
- Andi Osho as Sandra Cliff
- Andrea Irvine as Nicola Robinson
- Frank Blake as Shane Bradley
- Cathy Tyson as Dana Morgan
- Michael Smiley as Paul 'Colly' Collins
- Dearbháile McKinney as Aisling Byrne
- Abigail McGibbon as Tina McIntyre
- Charlie Maher as Fogerty
- Aoife Hughes as Lindsay Singleton
- Paula McFetridge as Marian
- Patrick McBrearty as John O'Boyle
Siân Brooke plays Grace Ellis
Who is Grace Ellis? Grace is a empathetic and caring former social worker who is now a constable in the Police Service of Northern Ireland. No longer a new recruit, Grace is faced with a blast from her past and is also navigating her relationship with Stevie.
Where have I seen Siân Brooke? Brooke is best known for her roles as Eurus Holmes in Sherlock, Deirdre Young in Good Omens and Aemma Arryn in House of the Dragon. She has also appeared in Trying, The Terror, Doctor Foster and more.
Martin McCann plays Stevie Neil
Who is Stevie Neil? Stevie is Grace's former mentor, who was tasked with getting her through her probation. They also have a romantic connection and this season, are tackling the prospect of moving in together whilst Stevie has also been promoted to Sergeant.
Where have I seen Martin McCann? McCann has previously appeared in series such as Marcella, The Fall, Vera, Temple and Say Nothing, as well as films including Clash of the Titans and '71.
Katherine Devlin plays Annie Conlon
Who is Annie Conlon? Annie is one of the constables in the PSNI, who joined around the same time as Grace. This season sees her navigate her own personal difficulties and the day-to-day threat of her job.
Where have I seen Katherine Devlin? Blue Lights is Devlin's first major role, after she previously appeared in 2018 film The Dig and one episode of Vikings.
Nathan Braniff plays Tommy Foster
Who is Tommy Foster? Tommy is another constable in the PSNI who joined at the same time as Grace and Annie. Having gotten into a relationship with Aisling, the pair now live together with Annie but the pressure of the job puts a strain on their relationship.
Where have I seen Nathan Braniff? Blue Lights is Braniff's first on-screen role.
Joanne Crawford plays Helen McNally
Who is Helen McNally? Helen is the Inspector in the PSNI team, having been promoted following the departure of Jonty. This season, an old acquaintance from her past turns up at the station looking for her help with an investigation.
Where have I seen Joanne Crawford? Crawford is known for her roles in series such as Line of Duty, The Fall and Chosen, as well as films including Ballywalter and To All My Darlings.
Andi Osho plays Sandra Cliff
Who is Sandra Cliff? Following the death of her husband Gerry in season 1, Sandra is no longer the main custody sergeant at the police station, but has instead been promoted to be the section’s skipper.
Where have I seen Andi Osho? Osho is known for her roles in series such as Good Omens, Sex Education, You & Me, The Sandman, Breeders, Stay Close, Line of Duty, I May Destroy You and Death in Paradise, as well as the DC film Shazam!.
Frank Blake plays Shane Bradley
Who is Shane Bradley? A constable who arrived in season 2 and is partnered up with Annie, with the pair sharing a romantic connection.
What have I seen Frank Blake before? Blake played Alan in the recent TV adaptation of Sally Rooney's Normal People. He has also appeared as Declan Fraser in Sanditon.
Andrea Irvine plays Nicola Robinson
Who is Nicola Robinson? The assistant chief constable at the station, Nicola receives a personal threat this season that underlines the threat of the job.
Where have I seen Andrea Irvine? Irvine has had roles in series and films including Ella Enchanted, The Fall, Line of Duty, Red Rock and Dead Shot.
Cathy Tyson as Dana Morgan
Who is Dana Morgan? Dana runs a private members club in Belfast but there's a lot more than meets the eye to her story, as we come to find out. Speaking about her character, Tyson teased that Dana "is like everybody else and there is a vulnerability to her. Tough characters can seem invulnerable but she’s not complacent. She can't take her foot off the pedal and that's exhausting to live like that."
Where have I seen Cathy Tyson? Tyson is known for her roles in Criminal Record, Boiling Point, The Sandman and Help. She has had various roles over the years and has also starred in Night & Day, Band of Gold and Mona Lisa.
Michael Smiley as Paul 'Colly' Collins
Who is Paul 'Colly' Collins? Colly is a former mentor and acquaintance of Helen's, who now works in the world of intelligence. He wants Helen's help with an ongoing case and tries to connect her with that criminal world again.
Where have I seen Michael Smiley? Smiley is known for his roles in Black Mirror, Bad Sisters, Dead Still and Luther. He has also had roles in Bleak House, Wire in the Blood, Obituary and Alien: Earth.
Dearbháile McKinney as Aisling Byrne
Who is Aisling Byrne? Now officially in a relationship with Tommy and living together, things should be on the up for Aisling but when a traumatic event unfolds, she is left in a more emotional place than ever.
Where have I seen Dearbháile McKinney? McKinney has featured in Kneecap, Murder Most Puzzling, Malpractice and Derry Girls.
Blue Lights cast – seasons 1 and 2
Hannah McClean plays Jen Robinson
Who is Jen Robinson? Jen was a police constable, but she left the PSNI at the end of season 1 after the death of Gerry Cliff. She is now a trainee solicitor.
Where have I seen Hannah McClean? McClean has previously had minor roles in series such as Josh and Sick Note.
Jonathan Harden plays David 'Jonty' Johnston
Who is David 'Jonty' Johnston? Jonty was previously the Inspector in charge at the station, but he was forced to resign after it was revealed he had been having an affair with Jen, his junior. In season 2, he is asked to return to the station in a more junior position, in order to utilise his experience and knowledge.
Where have I seen Jonathan Harden? Harden is known for his roles in series including Sherwood, Time Unforgotten and Peep Show and films such as Victoria & Abdul and Star Wars: The Last Jedi.
Desmond Eastwood plays Murray Canning
Who is Murray Canning? A detective sergeant now leading a Paramilitary Crime Taskforce, who in season 2 is investigating loyalist paramilitaries.
Where have I seen Desmond Eastwood? Eastwood has previously appeared in shows such as Blood, Normal People, Vikings and Derry Girls, along with films including In the Land of Saints and Sinners and The Last Rifleman.
Paddy Jenkins plays Happy Kelly
Who is Happy Kelly? Happy is the childhood friend of Gerry who suffered trauma and often wanted to be arrested so he wouldn't be alone. In season 2, Jen looks into a case from his past to try and help him move on.
What have I seen Paddy Jenkins before? Jenkins has had roles in Bel's Boys, Give My Head Peace, An Irish Goodbye and The Last Rifleman,
Seamus O’Hara plays Lee Thompson
Who is Lee Thompson? A Protestant from east Belfast who gets caught up in a loyalist feud.
Where have I seen Seamus O’Hara before? Viewers will recognise the actor from his previous roles in An Irish Goodbye and Dungeons & Dragons: Honour Among Thieves.
Seána Kerslake plays Mags Thompson
Who is Mags Thompson? Lee’s sister. The co-owner of The Loyal pub in Mount Eden in Belfast with her brother Lee.
Where have I seen Seána Kerslake before? Kerslake has previously starred in thriller series Smother, as well as comedies Bad Sisters and Ballywalter.
Craig McGinlay plays Craig McQuarrie
Who is Craig? Lee’s right-hand man.
Where else have I seen Craig McGinlay? McGinlay's acting credits include the TV series Cobra, You, Outlander and Knightfall.
Dan Gordon plays Rab Thompson
Who is Rab? Mags and Lee’s uncle.
Where else have I seen Dan Gordon? Gordon is best known for his roles as Noel Timoney in Bloodland, and Garda Summers in Northern Irish drama film Doineann.
Blue Lights season 3 will arrive on BBC iPlayer and BBC One on Monday 29th September. seasons 1-2 are available to stream in full on BBC iPlayer.
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