Jared Harris
Valery Legasov - 5 episoder

Stellan Skarsgård
Boris Shcherbina - 5 episoder

Emily Watson
Ulana Khomyuk - 5 episoder

Paul Ritter
Anatoly Dyatlov - 5 episoder

Jessie Buckley
Lyudmilla Ignatenko - 5 episoder

Adam Nagaitis
Vasily Ignatenko - 5 episoder

Sam Troughton
Alexandr Akimov - 5 episoder

Robert Emms
Leonid Toptunov - 5 episoder

Con O'Neill
Viktor Bryukhanov - 5 episoder

Adrian Rawlins
Nikolai Fomin - 5 episoder

Alan Williams
KGB Chairman Charkov - 5 episoder

David Dencik
Mikhail Gorbachev - 5 episoder

Mark Lewis Jones
General Pikalov - 5 episoder

Ralph Ineson
General Tarakanov - 5 episoder

Barry Keoghan
Pavel - 5 episoder

Alex Ferns
Glukhov - 5 episoder

Fares Fares
Bacho - 5 episoder

Michael McElhatton
Prosecutor Andrei Stepashin - 5 episoder

Laura Elphinstone
Oksana - 3 episoder

Michael Socha
Mikhail - 3 episoder

Karl Davies
Viktor Proskuryakov - 3 episoder

Jan Ričica
Oksana's Kid - 3 episoder

Nadia Clifford
Dr. Svetlana Zinchenko - 2 episoder

Ron Cook
Old Maternity Doctor - 2 episoder

Donald Sumpter
Zharkov - 2 episoder

Oscar Dyekjær Giese
Baranov - 2 episoder

Baltasar Breki Samper
Ananenko - 2 episoder

Gerard Kearns
Pravik - 2 episoder

Povilas Jatkevičius
Kibenok - 2 episoder

Darius Petkevičius
Local Husband - 2 episoder

Amanda Drew
Kremlin Aide Female - 2 episoder

Jamie Sives
Sitnikov - 2 episoder

Douggie McMeekin
Yuvchenko - 2 episoder

Cait Davis
Local Wife at Bar - 2 episoder

Michael Shaeffer
Blond Man - 2 episoder

Adam Lundgren
Brazhnik - 2 episoder

Billy Postlethwaite
Boris Stolyarchuk - 2 episoder

Jay Simpson
Perevozchenko - 2 episoder

Ross Armstrong
Nikolai Gorbachenko - 2 episoder

Paulius Markevičius
Aleksandr Kudryavstev - 2 episoder