Darkest Hour Trailer #1 (2017) : Check out the new trailer starring Lily James, Gary Oldman, and Ben Mendelsohn! Be the first to watch, comment, and share trailers and movie teasersclips dropping soon @MovieclipsTrailers. br br Within days of becoming Prime Minister, Winston Churchill must face his most turbulent and defining trial: exploring a negotiated peace treaty with Nazi Germany, or standing firm to fight for the ideals, liberty and freedom of a nation.