Fedor Alexandrovich as Himself

Andrei Alexandrovich as Fedor's Father

Igor Alexandrovich as Fedor's Son

Natalia Baranovskaya as Chernobyl Historian

Andrei Bilyk as Chernobyl Chief Engineer

Fedor Chebanenko as Duga Data Commander

Charlie D'Agata as Himself - CBS News Foreign Correspondent (archive footage)

Anatoly Duatlov as Chernobyl Engineer

Fedor Dubrovka as Radar Professor

Mikhail Gorbachev as Former President Russia (archive footage)

Viktor Yanukovich as Former President Ukraine (archive footage)

Georgiy Kopchinski as Last Soviet Head of Atomic Energy

Vladimir Komarov as Head of Chernobyl Investigation Committee

Vitali Klytsjko as Mayor of Kiev

Boris Gorbachev as