A former counter-terrorism officer transferred to Anti-Corruption Unit 12 (AC-12) after refusing to cover up an unlawful shooting by his team. He is partnered with DC Kate Fleming and works under Superintendent Ted Hastings to investigate police corruption.
Mary’s adviser and protector who orchestrates Darnley’s murder. He pressures Mary into an immediate marriage, threatens and rapes her, and his actions contribute to the political crisis that forces her to abdicate and flee to England.
Danny is a criminal who helps Vic kidnap Alice, then reveals that he is her former lover and plans to betray Vic. He alternates between restraining Alice and proposing a new life with her, is wounded by Vic, shoots Vic during their final confrontation, and is later found dead in the getaway car.
A ruthless assassin hired to murder Ella's father. He tracks Ella to the train and attempts to finish the job, but is ultimately shot dead by Richard Addison during the climax.
Scott is Justice's fiancé and secretly belongs to the werewolf pack. While he and Justice are being passionate, he bites her, causing her gradual transformation into a werewolf. His hidden identity and relationship with Justice connect the personal storyline to the larger confrontation between the pack and the strippers.
A ski resort employee who catches Simon stealing equipment. They form a partnership where Mike provides storage in exchange for refurbished skis. He later ends the partnership after rebuking Simon for involving a younger child in theft.
Barney's younger coworker at the barbershop. He suspects Barney of the boss's murder, confronts him, and is accidentally killed by Barney with a mop.
A sinister businessman who acquires Stanley. He represents the dangerous reality of the sex trade that Stanley encounters, driving the parallel storyline.
Mike O'Shea is Dito's Scottish friend, a boy who dreams of becoming a musician. He and Dito plan to travel by bus to California and work together for money. After a gang member murders Mike in retaliation for Young Antonio's violence, Dito leaves for California alone.
Liam is a sixteen-year-old boy and the central figure of the story. He begins as a school dropout selling untaxed cigarettes, then steals and sells drugs to buy a caravan for Jean and his family. His choices draw him into Tony's criminal organisation, violence against Pinball and Stan, and a final crisis involving the police and his future as an adult defendant.
Stevie is Clyde's former cellmate and housemate. At a bar, he becomes involved in a fight that Clyde breaks up, and he later returns to the apartment with April and Clyde. After Clyde is arrested, Stevie confronts Jackie at her home and demands to know why she falsely accused his friend.
A Scottish football supporter traveling toward Rome with other supporters. He joins their celebration, shares sandwiches, and offers food to Albanian Family Mother and her family before the mood turns hostile. When Albanian Family Boy appears to have used one of their tickets, Jamesy and the group accuse him of stealing and threaten to report him.
Martin Compston has 45 screen credits in a career dating back to 1996. Signature works include Line of Duty, The Rig, Four. Explore the interactive character relationship maps on each title page to trace how their roles connect across franchises.
