D-Day

D-Day was a term which was applied to the Normandy landings, part of Operation Overlord during the Second World War. (PROSE: Trace Memory)

The Doctor told Vice-Admiral Bertram Home Ramsay in 1940 that he "[had] D-Day to sort out". (AUDIO: The Nemonite Invasion)

BOSS, a computer which sought to dominate Earth, anticipated his own D-Day. (TV: The Green Death)