In May 1940, the fate of World War II hangs on Winston Churchill, who must decide whether to negotiate with Adolf Hitler or fight on knowing that it could mean the end of the British Empire.
Winston Churchill
Gary Oldman
Viscount Halifax
Stephen Dillane
Elizabeth Layton
Lily James
Neville Chamberlain
Ronald Pickup
King George VI
Ben Mendelsohn
Clemmie
Kristin Scott Thomas
Sir John Simon
Nicholas Jones
Sir Anthony Eden
Samuel West
Clement Atlee
David Schofield
General Ismay
Richard Lumsden
General Ironside
Malcolm Storry
Arthur Greenwood
Hilton McRae
Sir Samuel Hoare
Benjamin Whitrow
John Evans
Joe Armstrong
Air Chief Marshal Dowding
Adrian Rawlins
Admiral Ramsay
David Bamber
Admiral Dudley Pound
Paul Leonard
President Roosevelt (voice)
David Strathairn
Tom Leonard
Eric MacLennan
Sawyers
Philip Martin Brown
Cabinet Secretary Bridges
Demetri Goritsas
Randolph Churchill
Jordan Waller
Diana Churchill
Alex Clatworthy
Mary Churchill
Mary Antony
Sarah Churchill
Bethany Muir
Pamela Churchill
Anna Burnett
Lord Stanhope
Jeremy Child
Lord Kingsley Wood
Brian Pettifer
Lord Londonderry
Michael Gould
House of Commons Speaker
Paul Ridley
Ernle Hastings
Robin Pearce
Equerry
Michael Bott
Reynaud
Olivier Broche
Daladier
Mario Hacquard
BBC Producer
Pip Torrens
Actor
Edmund Wiseman
Abigail Walker
Hannah Steele
Alice Simpson
Nia Gwynne
Marcus Peters
Ade Dee Haastrup
Maurice Baker
James Eeles
Jessie Sutton
Flora Nicholson
Young Girl on Tube
Bronte Carmichael
Agnes Dillon
Roisin O'Neill
Oliver Wilson
John Locke
Margaret Jerome
Jo Neary
Brigadier Nicholson
Richard Glover
Ramsay Staffer
Tom Ashley
Reporter
Joshua Higgott
Teenage Girl at Tube Map
Imogen King
Naval Map-Room Officer
Miles Gallant
Sybil
Faye Marsay
Sir Alexander Cadogan
John Atterbury
AD Nicholl (Secretary #1)
James Harkness
W D Wilkinson (Secretary #2)
Joshua James
Christopher Wilson (Photographer)
Charley Palmer Rothwell
Maid
Patsy Ferran
Cook
Sarah Flind
Back Bencher
Steffan Donnelly
Cecil Beaton
Kieran Buckeridge
Member of Parliament (uncredited)
Johnny Otto
Sentry (uncredited)
Nick Howden-Steenstra