| Name | Character | Episodes |
|---|---|---|
| Ralph Ineson | Detective Inspector Morgan | 4 |
| Jenna Coleman | Ember | 4 |
| Archie Renaux | Hitch | 4 |
| Clare Calbraith | Joan | 4 |
| Tom Glynn-Carney | Malachy | 4 |
| Bo Bragason | Amy | 4 |
| Amelia Bullmore | Sylvia | 4 |
| Matthew McNulty | Arj | 4 |
| Ruby Stokes | Hannah | 4 |
| David Ajala | Casey | 4 |
| Dominic Coleman | Brad | 3 |
| Peter Sullivan | Blake | 3 |
| Georgina Rich | Sheena | 3 |
| Rick Warden | Martin | 3 |
| Connie Jenkins-Greig | Young Ember | 3 |
| Elliot Cowan | Russell | 2 |
| Natalie Gumede | Nina | 2 |
| Ruaridh Mollica | Troy | 2 |
| Philip Hill-Pearson | Rob | 2 |
| Adam Astill | Mr Ryan | 1 |
| Adam Astill | Mr. Ryan | 1 |
| Anna Wilson-Jones | Imogen | 1 |
| Philip Whitchurch | Superintendent Needham | 1 |
| Rick Warden | Martin Roberts | 1 |
| Lorna Nickson Brown | Kit / Present Caitlin | 1 |
| Lila Lasso | Conference Reporter | 1 |