 Jeff DanielsRonald Reagan | Ronald Reagan |
 Jared HarrisMikhail Gorbachev | Mikhail Gorbachev |
 J.K. SimmonsGeorge Shultz | George Shultz |
 Hope DavisNancy Reagan | Nancy Reagan |
 Branka KatićRaisa Gorbachev | Raisa Gorbachev |
 Aya CashCleo | Cleo |
 Guy BurnetAlexander | Alexander |
 Adrian RawlinsMax Rampleman | Max Rampleman |
 Tim DuttonEdward Shevardnadze | Edward Shevardnadze |
 Stephen BrennanPaul Nitze | Paul Nitze |
 Jóhannes Haukur JóhannessonRichard Perle | Richard Perle |
 John Ross BowieKen Adelman | Ken Adelman |
| CCatherine BurdonMargaret Clancy | Margaret Clancy |
 Joi JohannssonKGB Colonel | KGB Colonel |
 Ari Freyr Isfeld OskarssonKGB Officer | KGB Officer |
 Jóel SæmundssonCIA Officer | CIA Officer |
 Vladimir KulichSergey Akhromeyev | Sergey Akhromeyev |
 Hjörtur Jóhann JónssonMajor Alexei Ivanov | Major Alexei Ivanov |
| SSigurdur JeffersonColonel Tim Schilling | Colonel Tim Schilling |
| KKristín Lea SigríðardóttirSoviet Attaché | Soviet Attaché |
| TTristan RocheSamantha Lightning - WH Staffer | Samantha Lightning - WH Staffer |
| BBrynja AnderimanHorse Rider | Horse Rider |
 Sara Rut ArnardóttirRonald Regan Assistant (uncredited) | Ronald Regan Assistant (uncredited) |
| AAlexander BriemJournalist (uncredited) | Journalist (uncredited) |
| EEbba Guðný GuðmundsdóttirProtocol Officer (uncredited) | Protocol Officer (uncredited) |
| TTommi Thor GudmundssonUS Notetaker (uncredited) | US Notetaker (uncredited) |
 Einar HaraldssonUSSR Negotiating Team (uncredited) | USSR Negotiating Team (uncredited) |
 Jón JónssonTV Reporter (uncredited) | TV Reporter (uncredited) |
| JJafet Máni MagnúsarsonGorbachev KGB (uncredited) | Gorbachev KGB (uncredited) |
| AAxel ÓlafssonKGB Notetaker (uncredited) | KGB Notetaker (uncredited) |
