- Andrei Alexandrovich
- Fedor's Father
- Fedor Alexandrovich
- Self
- Igor Alexandrovich
- Fedor's Son
- Natalia Barabovskaya
- Chernobyl Historian
- Andrei Bilyk
- Chernobyl Chief Engineer
- Fedor Chebanenko
- Duga Data Commander
- Charlie D'Agata
- Self - CBS News Foreign Correspondent
- Anatoly Duatlov
- Chernobyl Engineer
- Fedor Dubrovka
- Radar Professor
- Mikhail Gorbachev
- Former President Russia
- Viktor Janoekovytsj
- Former President Ukraine
- Vitali Klytsjko
- Mayor of Kiev / Opposition Leader (archive footage)
- Vladimir Komarov
- Head of Chernobyl Investigation Committee
- Georgy Kopchinski
- Last Soviet Head of Atomic Energy
- Svetlana Korotkova
- Art Critic
- Nikolai Kravchuk
- Nuclear Physicist
- Andrew Michtrowski
- Canadian Government Official
- Vladimir Musiets
- Duga Commander
- Alexander Naumov
- Chief Guard Chernobyl Zone
- Leonid Petrov
- Duga Maintenance Chief
- Vadim Prokofiev
- Soviet Weapon Designer
- Vladimir Putin
- President Russia
- Artem Ryzhykov
- Self
- Vasily Shamshin
- Ministry of Communications Russia
- Yulia Shapovalova
- News Correspondent
- Nikolai Shkurat
- Duga Deputy Commander
- Yuriy Spizhenko
- Health Minister Ukraine
- Vladimir Usatenko
- Head of Parliments Chernobyl Commission
- Elena Yagodovskaya
- Fedor's Mother
- Vera Yagodovskaya
- Fedor's Grandmother
