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

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