| Person | Type | Job | Role(s) |
|---|---|---|---|
 Brendan Deasy | Crew | Sound | Sound Recordist |
Paul Myler | Crew | Production | Co-Producer |
Seamus Deasy | Crew | Camera | Director of Photography |
 Ken Galvin | Crew | Sound | Sound Re-Recording Mixer |
Juangus Dinsmore | Crew | Editing | Editor |
Clodagh Deegan | Crew | Costume & Make-Up | Wardrobe Supervisor |
Gerry Gregg | Crew | Directing | Director, Writer |
Ciarán O'Connor | Crew | Production | Executive Producer |
David Johnstone | Crew | Art | Art Direction, Property Master |
Khaki Devil | Crew | Costume & Make-Up | Costume Designer |
Jen Dunbar | Crew | Production | Production Manager |
Colm O'Callaghan | Crew | Production | Executive Producer |
Nuala Cunningham | Crew | Production | Producer |
Aishling Vesey | Crew | Crew | Post Production Supervisor |
 Adolf Hitler | Cast | Actor | Self - Politician (archive footage) |
 Dwight D. Eisenhower | Cast | Actor | Self - US Military (archive footage) |
 Erwin Rommel | Cast | Actor | Self - German Military (archive footage) |
 Franklin D. Roosevelt | Cast | Actor | Self - Politician (archive footage) |
 Joseph Goebbels | Cast | Actor | Self - Politician (archive footage) |
 Joseph Stalin | Cast | Actor | Self - Politician (archive footage) |
 Winston Churchill | Cast | Actor | Self - Politician (archive footage) |
 Bernard Montgomery | Cast | Actor | Self - British Military (archive footage) |
Robert Gerwarth | Cast | Self - Historian | |
Eva Sweeney | Cast | Young Maureen Flavin Sweeney | |
Colin Wright | Cast | General Dwight D. Eisenhower | |
Mike Johnson | Cast | Captain James Stagg | |
John Downes | Cast | Met Éireann Telephone Operator | |
Antony Beevor | Cast | Actor | Self - Historian |
Susan Eisenhower | Cast | Self - Eisenhower's Granddaughter | |
Joseph Skelly | Cast | Self - Historian | |
Richard G. Trefry | Cast | Self - Retired US Army Lt. General | |
Maureen Flavin Sweeney | Cast | Self - Weather Observer (1944) | |
Gerald Fleming | Cast | Self - Meteorologist | |
David McCullagh | Cast | Self - Journalist | |
Catherine Ross | Cast | Self - British Met Office Archivist | |
Jeremy Green | Cast | Self - British Military Police Colonel | |
Rodney Teck | Cast | Self - Climate Researcher | |
John C. Sweeney | Cast | Self - Climate Researcher | |
Vincent Sweeney | Cast | Self - Lighthouse Keeper | |
Richard Callaghan | Cast | Self - Royal MP Museum Curator | |
Joe Cattini | Cast | Self - D-Day Veteran | |
Éamon de Valera | Cast | Self - Politician (archive footage) | |
James Stagg | Cast | Self - Meteorologist (archive footage) | |
| Person | Type | Job | Role(s) |
