Guest Stars Oscar Unsworth as Rhodri Howells Harry Unsworth as Rhodri Howells Seren Letherby as Rhodri Howells Mark Lewis Jones as Steve Baldini Hannah Daniel as Cerys Jones Eiry Thomas as DI Susan Williams Lacey Jones as Megan Howells Demi Letherby as Alys Howells Aneirin Hughes as Tom Howells Bradley Freegard as Evan Howells Suzanne Packer as Delyth Lloyd Catherine Ayers as Lisa Connors Alex Harries as Arthur Davis Rhian Morgan as Marion Howells Mali Harries as Bethan Price Matthew Gravelle as Terry Price Richard Elfyn as DCI Huw Parry Menna Trussler as Eira Jones Nia Roberts as Saran James Beth Robert as Rhona Baldini Connaugh Howard as Boxer