- Steven Meo - DI Lynne Harries
- Richard Corgan - DS Glyn Johnson
- Kyle Lima - DC Nigel Rowe
- Steffan Cennydd - Jack Wilkins
- William Thomas - DCI George Jones
- Suzanne Packer - Chief Constable Tyler
- Mabli Jen Eustace - Amy Wilkins
- Hywel Morgan - Prison Governor
- Francine Morgan - Parole Board Judge
- Joanna van Kampen - Parole Board Member 1
- Andrew MacBean - Parole Board Member 2
- Sue Cook - Self (archive footage) (uncredited)
- Rhys Parry Jones - Pub Landlord
- Edward Llewelyn - Sergeant
- Roger Evans - DCI Jim Morris (uncredited)
- Roger Evans - DCI Jim Morris
- Owen Teale - Gerard Elias QC
- Ian Saynor - Justice Sir John Griffith Williams
- Ioan Hefin - Mark Evans QC
- Anastasia Hille - Dr. Angela Gallop
- Jim Bowen - Self (archive footage) (uncredited)
- Jim Bowen - Self (voice) (archive footage) (uncredited)
- Simon Nehan - Craig
- Simon Nehan - Craig (uncredited)
- Sara Gregory - Leanne Dauncey
- Amy Morgan - Erin Davies
- Simon Armstrong - Oliver Wakefield
- Anita Reynolds - Court Usher
- Rhiannon Meades - Court Clerk
- Marc Evans
- Nick Stevens
Luke Evans hace el papel de DCS Steve Wilkins.
Keith Allen hace el papel de John Cooper.
Caroline Berry interpreta a Pat Cooper en la serie.
Oliver Ryan hace el papel de Andrew Cooper.
Alexandria Riley hace el papel de DI Ella Richards.
Charles Dale interpreta a DS Gareth Rees en la serie.
David Fynn hace el papel de Jonathan Hill.
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