Season Regulars 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

Guest Stars 19

1. 

   Caoilfhionn Dunne

   Yenina

2. 

   Philip Barantini

   Bezpalov

3. Oscar Dyekjær Giese

   Baranov

4. Baltasar Breki Samper

   Ananenko

5. 

   Pandora Colin

   Dr. Vetrova

6. 

   Gerard Kearns

   Pravik

7. 

   Povilas Jatkevičius

   Kibenok

8. Rachel Atkins

   Niyazova

9. 

   Darius Petkevičius

   Local Husband

10. 

    James Cosmo

    Miner

11. Arnas Danusas

    Soldier (Miner's Bus)

12. 

    Michael Colgan

    Mikhail Shadov

13. 

    James Kermack

    Miner

14. Karolis Vilkas

    Miner

15. 

    Amanda Drew

    Kremlin Aide Female

16. Cait Davis

    Local Wife at Bar

17. 

    Michael Shaeffer

    Blond Man

18. Šarūnas Datenis

    Soldier (Reactor Site)

19. Deividas Breivė

    Soldier (Mobile Office)

Crew 16