Jared Harris Valery Legasov

Stellan Skarsgård Boris Shcherbina

Emily Watson Ulana Khomyuk

Paul Ritter Anatoly Dyatlov

Jessie Buckley Lyudmilla Ignatenko

Adam Nagaitis Vasily Ignatenko

Sam Troughton(샘 트로튼) Alexandr Akimov

Robert Emms Leonid Toptunov

Con O'Neill Viktor Bryukhanov

Adrian Rawlins Nikolai Fomin

Alan Williams KGB Chairman Charkov

David Dencik Mikhail Gorbachev

Mark Lewis Jones General Pikalov

Ralph Ineson General Tarakanov

Barry Keoghan Pavel

Alex Ferns Glukhov

Fares Fares Bacho

Michael McElhatton Prosecutor Andrei Stepashin

Laura Elphinstone Oksana

Michael Socha(Майкл Соча) Mikhail

Karl Davies Viktor Proskuryakov

Jan Ričica Oksana's Kid

Nadia Clifford Dr. Svetlana Zinchenko

Ron Cook Old Maternity Doctor

Donald Sumpter Zharkov

Philip Barantini(필립 바란티니) Bezpalov

Oscar Dyekjær Giese Baranov

Baltasar Breki Samper Ananenko

Gerard Kearns Pravik

Povilas Jatkevičius Kibenok

Darius Petkevičius Local Husband

Amanda Drew Kremlin Aide Female

Jamie Sives Sitnikov

Douggie McMeekin Yuvchenko

Cait Davis Local Wife at Bar

Michael Shaeffer Blond Man

Craig Mazin

Johan Renck

Craig Mazin

Svetlana Alexievich