Elenco Principal da Temporada 18

1. 

   Jared Harris

   Valery Legasov

2. 

   Stellan Skarsgård

   Boris Shcherbina

3. 

   Emily Watson

   Ulana Khomyuk

4. 

   Paul Ritter

   Anatoly Dyatlov

5. 

   Jessie Buckley

   Lyudmilla Ignatenko

6. 

   Adam Nagaitis

   Vasily Ignatenko

7. 

   Sam Troughton

   Alexandr Akimov

8. 

   Robert Emms

   Leonid Toptunov

9. 

   Con O'Neill

   Viktor Bryukhanov

10. 

    Adrian Rawlins

    Nikolai Fomin

11. 

    Alan Williams

    KGB Chairman Charkov

12. 

    David Dencik

    Mikhail Gorbachev

13. 

    Mark Lewis Jones

    General Pikalov

14. 

    Ralph Ineson

    General Tarakanov

15. 

    Barry Keoghan

    Pavel

16. 

    Alex Ferns

    Glukhov

17. 

    Fares Fares

    Bacho

18. 

    Michael McElhatton

    Prosecutor Andrei Stepashin

Convidados Especiais 12

1. 

   June Watson

   Old Woman Babushka

2. 

   Josef Altin

   Soldier

3. 

   Sergejus Ivanovas

   Survey Soldier

4. 

   Alexej Manvelov

   Garo

5. 

   Josef Davies

   Janek

6. 

   Velta Žygurė

   Elderly Librarian

7. Paulius Cizinauskas

   KGB Agent Library

8. Mark Bagnall

   Jughashvili (Robot Operator)

9. 

   Ian Pirie

   Site Officer Masha

10. Andrew Sheridan

    Biorobot

11. 

    Lukas Malinauskas

    Biorobot Soldier

12. Marius Karolis Gotbergas

    Biorobot Soldier

Equipa técnica 9