| Name | Character | Episodes |
|---|---|---|
| Eve Myles | Faith Howells | 20 |
| Mali Harries | Bethan Price | 8 |
| Matthew Gravelle | Terry Price | 8 |
| Mark Lewis Jones | Steve Baldini | 8 |
| Bradley Freegard | Evan Howells | 8 |
| Eiry Thomas | DI Williams | 8 |
| Aneirin Hughes | Tom Howells | 8 |
| Hannah Daniel | Cerys Jones | 8 |
| Catherine Ayers | Lisa | 8 |