Darkest Hour is a 2017 British biographical war drama film directed by Joe Wright and written by Anthony McCarten. It stars Gary Oldman as Winston Churchill, in his early days as Prime Minister of the United Kingdom during the Second World War and the May 1940 war cabinet crisis. The cast also includes Kristin Scott Thomas as Clementine Churchill, Lily James as Elizabeth Layton, Stephen Dillane as Viscount Halifax, Ronald Pickup as Neville Chamberlain, and Ben Mendelsohn as King George VI. The title of the film refers to a description of the early days of the war, widely attributed to Churchill.

Plot

In May 1940, the opposition Labour Party in Parliament demand the resignation of British prime minister Neville Chamberlain for being too weak in the face of the Nazi onslaught. Conservative Party colleagues want Lord Halifax as his successor, but Halifax does not feel it is his time. Chamberlain chooses the only man whom the opposition will accept as leader of a national government: Winston Churchill, who had correctly predicted the danger from Adolf Hitler before the war but has a poor reputation in Parliament.