Eva Sweeney
Role: Young Maureen Flavin Sweeney
Colin Wright
Role: General Dwight D. Eisenhower
Mike Johnson
Role: Captain James Stagg
John Downes
Role: Met Éireann Telephone Operator
Antony Beevor
Role: Self - Historian
Robert Gerwarth
Role: Self - Historian
Susan Eisenhower
Role: Self - Eisenhower's Granddaughter
Joseph Skelly
Role: Self - Historian
Richard G. Trefry
Role: Self - Retired US Army Lt. General
Maureen Flavin Sweeney
Role: Self - Weather Observer (1944)
Gerald Fleming
Role: Self - Meteorologist
David McCullagh
Role: Self - Journalist
Catherine Ross
Role: Self - British Met Office Archivist
Jeremy Green
Role: Self - British Military Police Colonel
Rodney Teck
Role: Self - Climate Researcher
John C. Sweeney
Role: Self - Climate Researcher
Vincent Sweeney
Role: Self - Lighthouse Keeper
Richard Callaghan
Role: Self - Royal MP Museum Curator
Joe Cattini
Role: Self - D-Day Veteran
Adolf Hitler
Role: Self - Politician (archive footage)
Bernard Montgomery
Role: Self - British Military (archive footage)
Dwight D. Eisenhower
Role: Self - US Military (archive footage)
Éamon de Valera
Role: Self - Politician (archive footage)
Erwin Rommel
Role: Self - German Military (archive footage)
Franklin D. Roosevelt
Role: Self - Politician (archive footage)
James Stagg
Role: Self - Meteorologist (archive footage)
Joseph Goebbels
Role: Self - Politician (archive footage)
Joseph Stalin
Role: Self - Politician (archive footage)
Winston Churchill
Role: Self - Politician (archive footage)