- Colin Firth Ewen Montagu
- Matthew MacFadyen Charles Cholmondeley
- Kelly Macdonald Jean Leslie
- Penelope Wilton Hester Leggett
- Johnny Flynn Ian Fleming
- Jason Isaacs Admiral John Godfrey
- Alex Jennings John Masterman
- Mark Gatiss Ivor Montagu
- Hattie Morahan Iris Montagu
- James Fleet Charles Fraser-Smith
- Alexander Beyer Karl Kuhlenthal
- Simon Russell Beale Winston Churchill
- Nicholas Rowe Capt. David Ainsworth
- Óscar Zafra Colonel Cerruti
- Pedro Casablanc Dr. Del Torno
- Javier Godino Judge Pascual Del Pobil
- Pep Tosar Admiral Moreno
- Mark Bonnar Jock Horsfall
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