| Name | Character | Episodes |
|---|---|---|
| Han Hyo-joo | SoYun Pak | 10 |
| Michelle Forbes | Ellen Becker | 10 |
| Omar Metwally | Matt Edwards | 10 |
| Jeremy Irvine | J. Randolph Bentley | 10 |
| Brian J. Smith | Doug McKenna | 10 |
| Tracy Ifeachor | Tara Coleman | 10 |
| Emilia Schüle | Young Petra Andropov | 10 |
| Gabrielle Scharnitzky | Petra Andropov | 10 |
| Michael Gaston | Dan Levine | 8 |
| Tess Haubrich | Samantha McKenna | 8 |
| Patrick Fugit | Stephen Haynes | 6 |
| Tom Mothersdale | Ferguson | 4 |
| Oliver Walker | Matheson | 4 |
| Finbar Lynch | Dr. Martin Wells | 3 |
| Emmett Scanlan | Spencer | 3 |
| Merab Ninidze | Yuri Leniov | 3 |
| David Michaels | Tom Becker | 3 |
| Cosima Shaw | Anna Collier | 3 |
| Lee Joo-sil | Yumi | 2 |
| Martin Umbach | Dr. Gustav Meisner | 2 |
| Dylan Smith | Lowell | 2 |
| Donald Sage Mackay | Greg Sanders | 2 |
| Kang Ye-na | Sungmi | 2 |
| Eric Kofi Abrefa | Sebastian Blair | 2 |
| Marek Vašut | Max | 2 |
| Adam Astill | Andy Moore | 2 |
| Jamie Andrew Cutler | Goatee | 2 |
| Roderick Hill | Karoli | 2 |
| Gen Seto | Old Man | 2 |
| Jan Hammenecker | Marten Van Roon | 2 |
| Martin Umbach | Dr. Meisner | 1 |
| Annabelle Apsion | Bentley's Mother | 1 |
| Tzi Ma | General Chin-Hwa Kwon | 1 |
| Kerry Godliman | Carol | 1 |
| Kerry Godliman | Carol Jane Devers | 1 |
| Tim Ahern | Senator Eamon Wray | 1 |
| Tim Ahern | Senator Wray | 1 |
| Cian Barry | British Prisoner | 1 |
| Fernando Guillén Cuervo | Hector Portillo | 1 |
| Julian Kostov | Yuri Leniov (1973) | 1 |
| Julian Kostov | Yuri Leniov | 1 |
| Daniel Weyman | Macy | 1 |
| Set Sjöstrand | Nolan Navelle | 1 |
| Set Sjöstrand | Nolan Lavelle | 1 |
| Alan McKenna | Dr. Sachs | 1 |
| Manos Gavras | Bartender | 1 |
| Martin Goeres | Vincent | 1 |
| Peter Schueller | Deputy | 1 |
| Hans Peterson | Casino Bartender | 1 |
| Yuna Shin | Salesgirl | 1 |