| Person | Type | Job | Role(s) | Episodes |
|---|---|---|---|---|
 Marc Evans | Crew | Directing | Director | 3 |
 Simon Heath | Crew | Production | Executive Producer | 3 |
 Ed Talfan | Crew | Production | Producer | 3 |
 Jonathan Hill | Crew | Production | Executive Producer | 3 |
Nick Stevens | Crew | Writing | Writer, Executive Producer, Creator | 3 |
 Anastasia Hille | Cast | Actress | Dr. Angela Gallop | 2 |
Anita Reynolds | Cast | Actress | Court Usher | 1 |
 Caroline Berry | Cast | Actress | Pat Cooper | 3 |
 Charles Dale | Cast | Actor | DS Gareth Rees | 3 |
Francine Morgan | Cast | Parole Board Judge | 1 | |
 Keith Allen | Cast | Actor | John Cooper | 3 |
 Owen Teale | Cast | Actor | Gerard Elias QC | 1 |
 Rhys Parry Jones | Cast | Actor | Pub Landlord | 1 |
 Roger Evans | Cast | Actor | DCI Jim Morris (uncredited) | 2 |
 Steven Meo | Cast | Actor | DI Lynne Harries | 3 |
Sue Cook | Cast | Self (archive footage) (uncredited) | 1 | |
 Suzanne Packer | Cast | Actress | Chief Constable Tyler | 1 |
 William Thomas | Cast | Actor | DCI George Jones | 1 |
 Amy Morgan | Cast | Actress | Erin Davies | 1 |
 Hywel Morgan | Cast | Actor | Prison Governor | 1 |
 Luke Evans | Cast | Actor | DCS Steve Wilkins | 3 |
 Oliver Ryan | Cast | Actor | Andrew Cooper | 3 |
 Sara Gregory | Cast | Actress | Leanne Dauncey | 1 |
 Simon Armstrong | Cast | Actor | Oliver Wakefield | 2 |
 Simon Nehan | Cast | Actor | Craig (uncredited) | 1 |
 David Fynn | Cast | Actor | Jonathan Hill | 3 |
 Ioan Hefin | Cast | Actor | Mark Evans QC | 1 |
Ian Saynor | Cast | Actor | Justice Sir John Griffith Williams | 1 |
 Jim Bowen | Cast | Actor | Self (voice) (archive footage) (uncredited) | 1 |
 Alexandria Riley | Cast | Actress | DI Ella Richards | 3 |
 Andrew MacBean | Cast | Actor | Parole Board Member 2 | 1 |
 Kyle Lima | Cast | Actor | DC Nigel Rowe | 3 |
 Richard Corgan | Cast | Actor | DS Glyn Johnson | 3 |
 Steffan Cennydd | Cast | Actor | Jack Wilkins | 3 |
 Edward Llewelyn | Cast | Sergeant | 1 | |
Joanna van Kampen | Cast | Actress | Parole Board Member 1 | 1 |
Sarah Jane | Cast | Actress | Police Officer (uncredited) | 1 |
Rhodri Evan | Cast | DCS Coles | 2 | |
Mabli Jen Eustace | Cast | Actress | Amy Wilkins | 1 |
| Person | Type | Job | Role(s) | Episodes |
