Episode 1 of the documentary series "The Last Great Crusade" offers a  detailed account of the planning and execution of the D-Day landings in Normandy during World War II. It describes the events leading up to the invasion, including the rise of Nazi Germany, the evacuation of British troops at Dunkirk, and the entry of the United States into the war. The immense logistical challenges faced by the Allies in preparing for the invasion, such as amassing troops, vehicles, and supplies across the English Channel are highlighted. Viewers will gain an understanding of the importance of the D-Day landings in turning the tide of the war and liberating Europe from Nazi occupation, and the sacrifices made by the soldiers who participated in this historic event.