British Prime Minister Winston Churchill suffers from a stroke in the summer of 1953 that's kept a secret from the rest of the world.

Michael Gambon
as Winston Churchill

Lindsay Duncan
as Clemmie Churchill

Romola Garai
as Millie Appleyard

Matthew Macfadyen
as Randolph Churchill

Tara Fitzgerald
as Diana Churchill

Rachael Stirling
as Sarah Churchill

Bill Paterson
as Lord Moran

Daisy Lewis
as Mary Churchill

Alex Jennings
as Anthony Eden

Chris Larkin
as Rab Butler