BBC One's Irish police procedural drama, Blue Lights, starring Sian Brooke and Katherine Devlin, will be back for Season 4. The buzz is strong, and fans are truly enjoying this police procedural series that delves into the lives of the officers of the Police Service of Northern Ireland. The IMDb and Rotten scores are buzzing with positive reviews.Each hour plunges the officers into new challenges and dangers as they fight together to keep a check on the crimes in Belfast. Season 3 of Blue Lights leans into consequence. Each storyline funnels into character choices that have been building since the premiere, and the cast does an impeccable job. The synopsis of Blue Lights Season 3 Episode 6 titled, World of Our Own" reads, (via BBC One)"Grace and Sean are under serious threat, while Lindsay's testimony exposes the Ginleys. Colly takes a risk to go after Morgan, and Fogerty decides Tina is no longer useful."Below is a spoiler-free cast and character guide for the Season 3 finale.Blue Lights Season 3 Episode 6 cast and character guideDiona Doherty as DI Louise CarriganDiona Doherty's Louise Kerrigan remains the show's commanding figure. As DI, Kerrigan operates with precision and authority, particularly in the opening moments of the finale. Doherty's performance thrives in stillness. When Kerrigan gives instructions, they land because she never doubts herself. She does not change recognition, which makes her influence even stronger.Sian Brooke as Grace EllisGrace Ellis is the emotional centre of Blue Lights Season 3, and the finale tests her resolve. Played with quiet intensity by Sian Brooke, Grace is no longer the uncertain officer introduced in Season One. She is alert, disciplined, and deeply aware of how fragile control can be. In the finale, she's forced into situations where trust is thin and danger is immediate. Brooke never overplays fear. Instead, she subtly portrays what's beneath Grace's calm exterior. In the finale episode, we learn about Grace's traumatic past as she narrates it to Stevie.Martin McCann as Stevie NeilAnother fellow officer (now Acting Sergeant) and Grace's partner, Stevie Neil, is defined by emotional intelligence, and Episode 6 finally allows that trait to take centre stage. Stevie spends much of the finale confronting the fallout of his own mistake. Rather than being the knight in shining armour, the episode positions Stevie as someone who's learning how to listen and step back. By the end of the finale episode, Stevie emerges as someone who understands the cost of the job. When he learns about Grace's traumatic past, he initially feels hurt, but at the next moment, he consoles Grace. He tells her that the past does not matter.Frank Blake as Shane BradleyFrank Blake's Shane Bradley spends much of Blue Lights Season 3 Episode 6 in recovery, but his presence is emotionally significant. A fellow constable at PSNI, his storyline focuses less on physical injury and more on reflection. In Episode 6, he finally returns to work, but this time with a crutch. We get glimpses of his fear and stubbornness. His determination to return to police work is commendable, though his family wants him to quit.Abigail McGibbon as Tina McIntyreTina McIntyre's arc reaches a turning point in the finale, and Abigail McGibbon plays it with controlled intensity. Tina is no longer reacting to threats. She is anticipating them. Episode 6 of Blue Lights Season 3 reframes her as a strategist rather than a pawn, and McGibbon's performance reflects the evolution.Michael Smiley as Paul "Colly" CollinsMichael Smiley brings complexity to Paul Collins, a character who thrives in ambiguity. He was introduced as Helen's former mentor and intelligence group member who needs Helen's help to solve a case. Colly exists between law enforcement and manipulation. He is capable of charm, calculation, and moral detachment.Other pivotal characters of Blue Lights Season 3 Episode 6 are as follows: View this post on Instagram Instagram PostKatherine Devlin as Annia Conlon, another fellow officerMatthew Frosythe as Aodhan McAllisterConor Mullen as George McClelland, the accountant who is now in legal troubleJoanne Crawford as Helen McNally, inspector in chargeLorcan Cranitch as Harry BradleySophia Adli as Dr. KerbashFrank Blake as Shane BradleyAndi Osho as Sandra Cliff, a member of the police team and now the section's skipper.Charlie Maher as Donal FogertyNathan Braniff as Tommy Foster, police officer and Ainsling's partner. In the final episode, he tries to fix things with Ainsling. He also grows suspicious of the private club and digs up evidence.Michael Shea as Mo McIntyre, Tina's sonAoibheann McCann as Geraldine GilroyCathy Tyson, as Dana Morgan, runs an upscale private club in BelfastDearbhaile McKinney as Aisling, a fellow officer who's in a relationship with Tommy. After she gets injured in a car crash in Blue Lights Season 3, Tommy tries to fix things, but she tells him that she requires time and space.Seamus O' Hara as Lee Thompson, a protestant from East BelfastAoife Hughes as Lindsay, a troubled teen whose case is handled by GracePaula McFetridge as MarianFrankie McCafferty as BarneyBrendan Quinn as Sean MullhollandFollow SoapCentral for more such updates on Blue Lights Season 3.