| EEva SweeneyYoung Maureen Flavin Sweeney | Young Maureen Flavin Sweeney |
| CColin WrightGeneral Dwight D. Eisenhower | General Dwight D. Eisenhower |
| MMike JohnsonCaptain James Stagg | Captain James Stagg |
| JJohn DownesMet Éireann Telephone Operator | Met Éireann Telephone Operator |
 Antony BeevorSelf - Historian | Self - Historian |
| RRobert GerwarthSelf - Historian | Self - Historian |
| SSusan EisenhowerSelf - Eisenhower's Granddaughter | Self - Eisenhower's Granddaughter |
| JJoseph SkellySelf - Historian | Self - Historian |
| RRichard G. TrefrySelf - Retired US Army Lt. General | Self - Retired US Army Lt. General |
| MMaureen Flavin SweeneySelf - Weather Observer (1944) | Self - Weather Observer (1944) |
| GGerald FlemingSelf - Meteorologist | Self - Meteorologist |
| DDavid McCullaghSelf - Journalist | Self - Journalist |
| CCatherine RossSelf - British Met Office Archivist | Self - British Met Office Archivist |
| JJeremy GreenSelf - British Military Police Colonel | Self - British Military Police Colonel |
| RRodney TeckSelf - Climate Researcher | Self - Climate Researcher |
| JJohn C. SweeneySelf - Climate Researcher | Self - Climate Researcher |
| VVincent SweeneySelf - Lighthouse Keeper | Self - Lighthouse Keeper |
| RRichard CallaghanSelf - Royal MP Museum Curator | Self - Royal MP Museum Curator |
| JJoe CattiniSelf - D-Day Veteran | Self - D-Day Veteran |
 Adolf HitlerSelf - Politician (archive footage) | Self - Politician (archive footage) |
 Bernard MontgomerySelf - British Military (archive footage) | Self - British Military (archive footage) |
 Dwight D. EisenhowerSelf - US Military (archive footage) | Self - US Military (archive footage) |
| ÉÉamon de ValeraSelf - Politician (archive footage) | Self - Politician (archive footage) |
 Erwin RommelSelf - German Military (archive footage) | Self - German Military (archive footage) |
 Franklin D. RooseveltSelf - Politician (archive footage) | Self - Politician (archive footage) |
| JJames StaggSelf - Meteorologist (archive footage) | Self - Meteorologist (archive footage) |
 Joseph GoebbelsSelf - Politician (archive footage) | Self - Politician (archive footage) |
 Joseph StalinSelf - Politician (archive footage) | Self - Politician (archive footage) |
 Winston ChurchillSelf - Politician (archive footage) | Self - Politician (archive footage) |
