| Name | Character | Episodes |
|---|---|---|
| Keira Knightley | Helen Webb | 6 |
| Ben Whishaw | Sam Young | 6 |
| Andrew Koji | Jason | 6 |
| Andrew Buchan | Wallace | 6 |
| Ella Lily Hyland | Williams | 6 |
| Sam Troughton | Stephen Yarrick | 6 |
| Sarah Lancashire | Mrs. Reed | 6 |
| Omari Douglas | Michael | 6 |
| Isabella Wei | Kai-Ming | 6 |
| Gabrielle Creevy | Eleanor | 5 |
| Kathryn Hunter | Lenny | 4 |
| Finn Bennett | Cole Atwood | 4 |
| Agnes O'Casey | Dani | 4 |
| Callum Coates | Thomas | 4 |
| Adeel Akhtar | Prime Minister Eaves | 3 |
| William Hope | Mitch Porter | 3 |
| Nathan Stewart-Jarrett | Zack | 3 |
| Adam Silver | Arnie | 3 |
| Tracey Ullman | Alex Clark | 2 |
| Tim Faraday | Alex Clark's bodyguard | 2 |
| Paapa Essiedu | Elmore Fitch | 2 |
| Thomas Coombes | Phillip | 2 |
| Steve Wall | Frank | 2 |
| Justine Mitchell | Emma | 2 |
| Adam Best | Agent Perryman | 2 |
| Hannah Khalique-Brown | Maggie | 2 |
| Sam Parks | James | 1 |
| Julian Wadham | Andy | 1 |
| Antonia Campbell-Hughes | Georgina | 1 |
| Thomas Chaanhing | Hang Chao | 1 |
| Claudia Jolly | Ingrid | 1 |
| Brett Tutor | Security Guard | 1 |
| Lizzie Hopley | Beth | 1 |
| Jennifer Armour | Vanessa | 1 |
| Philipp Christopher | Daniel | 1 |