- Michael Elwyn - Lionel Logue
- Amber Sealey - Wallis Simpson
- Jeremy Child - Sir Samuel Hoare
- David Ryall - Winston Churchill
- Paul Brooke - Tommy Lascelles
- David Burke - Lord Reith
- Robert Hardy - President Roosevelt
- Jeremy Swift - Royal Page
- Helen Ryan - Queen Wilhelmina
- Joanna Hole - East End woman
- Elisabeth Dermot Walsh - Lillibet
- Corin Redgrave - General Montgomery
- Jack Whitehall - Little Boy (uncredited)
- Denis Lill - Clement Attlee
- Giles Foster
- Nigel Williams
- Kate Rhodes James
- Michael Whitehall
- Jonathan Powell
- Rebecca Eaton
- Ilona Sekacz
Capítulo disponible en las siguientes plataformas: