Guest Stars Victoria Pugh as DSI Susan Lynn Garmon Rhys as PC Ryan Davies Lowri Izzard as PC Mari James Megan Llyn as Bethan John Ffion Dafis as Kelly Owen Lisa Victoria as Catrin Pritchard Owain Gwynn as Sion Wells Lois Elenid as Beca Mathews Jac Jones as Liam Pritchard Bryn Fôn as Hefin Mathews Melangell Dolma as Sam Shepherd Dyfrig Evans as Glyn Jones Manon Prysor as Rhian Jenkins Gruffydd Wyn Jones as Jason Williams Mark Robert-Flanagan as Karl Lewis Nia Haf as Lois Jones Paul Whitlock as Roy Brooke Morgan as Babi Gwyn Vaughan Jones as Gwenidog Llion Williams as Ifan Jenkins