Guest Stars Victoria Pugh as DSI Susan Lynn Garmon Rhys as PC Ryan Davies Lowri Izzard as PC Mari James Sarah Tempest as Alys Mitchell Megan Llyn as Bethan John Ffion Dafis as Kelly Owen Lisa Victoria as Catrin Pritchard Owain Gwynn as Sion Wells Bryn Fôn as Hefin Mathews Lois Elenid as Beca Mathews Melangell Dolma as Sam Shepherd Jac Jones as Liam Pritchard Dyfrig Evans as Glyn Jones Manon Prysor as Rhian Jenkins Mali Tudno Jones as Rachel West Carys Gwilym as Siwan Morgan Brooke Morgan as Babi Richard Mylan as Mr Collins Tomos Wyn as Cyfwelydd Alec James as Geraint Ellis