| Name | Character | Episodes |
|---|---|---|
| Lena Olin | Irina Atman Clios | 21 |
| Dimitri Leonidas | Christos Clios | 21 |
| Roxane Duran | Adriana Clios | 21 |
| Julia Stiles | Georgina Marjorie Clios | 20 |
| Anthony LaPaglia | Constantine Clios | 17 |
| Poppy Delevingne | Daphne Eltham | 17 |
| Igal Naor | Jakob Negrescu | 15 |
| Iwan Rheon | Adam Clios | 13 |
| Adrian Lester | Robert Carver | 11 |
| Will Arnett | Jeff Carter | 10 |
| Alex Lanipekun | Raafi Al-Qadar | 10 |
| Juliet Stevenson | Cassandra Eltham | 10 |
| Amr Waked | Karim Delormes | 10 |
| Phil Davis | Jukes | 9 |
| Vincent Perez | Police Commissioner | 9 |
| Julia Stiles | Georgina Ryland | 8 |
| Synnøve Macody Lund | Alex Harewood | 8 |
| Nicholas Rowe | Geoffrey Anderton | 8 |
| Nora Arnezeder | Nadia | 8 |
| Rupert Graves | Gabriel Hirsch | 8 |
| Clare-Hope Ashitey | Ellen Swann | 8 |
| Franco Masini | Cesar Alsina-Suarez | 7 |
| Grégory Fitoussi | Noah Levy | 5 |
| Olivia Popica | Fatima | 5 |
| Morgan Kelly | Kurt Ryland | 4 |
| Peder Thomas Pedersen | Lucas Carlsson | 3 |
| Olga Kent | Anna Litvinov | 1 |