- Rachel Gurney - Clara Holland
- Martin Stephens - John Holland
- Waveney Lee - Marcia Holland
- Charles Carson - Robert Holland
- Junia Crawford - Susan
- Henry B. Longhurst - Club Member (as Henry Longhurst)
- Roger Maxwell - Club Member
- Gerald Case - Club Member
- Donald Bisset - Club Member
- Desmond Roberts - Club Member
- Reginald Smith - Club Steward
- MacDonald Parke - Jason Parrish (as Macdonald Parke)
- Mavis Villiers - Adele Parrish
- Ernest Clark - Cmdr. Bates
- Alexander Archdale - Local Doctor (uncredited)
- Basil Dignam - Lt. Cmdr. Evans at P.R.O. (uncredited)
- Gordon Harris - 2nd Special Branch Man Jones (uncredited)
- Barbara Hicks - Miss Price (uncredited)
- John Horsley - 1st Editor (uncredited)
- John Le Mesurier - Head of the Admiralty (uncredited)
- Ronald Leigh-Hunt - 2nd Editor (uncredited)
- Richard Marner - Russian Officer Cornered by Max Easton (uncredited)
- William Mervyn - Capt. Balfour (uncredited)
- Andre Mikhelson - 2nd Russian Officer (uncredited)
- Dickie Owen - 2nd Policeman (uncredited)
- Frederick Piper - Hall Porter (uncredited)
- Pat Ryan - Nightclub Patron (uncredited)
- Stanley Zevic - 1st Russian Officer (uncredited)
- Guy Hamilton
- Guy Hamilton
- Irene Howard
James Mason interpreta a Cmdr. Max Easton en la película.
George Sanders interpreta a Sir Charles Holland en la película.
Vera Miles hace el papel de Virginia Killain.
Robert Flemyng hace el papel de Cmdr. John Larkin.
Oliver Johnston hace el papel de Minister.
William Kendall interpreta a Tom en la película.
Duncan Lamont hace el papel de 1st Special Branch man Gregson.
Harry Andrews interpreta a Capt. Graham en la película.
Peter Barkworth interpreta a Sub Lt. Brown en la película.
Rachel Gurney interpreta a Clara Holland en la película.
Martin Stephens interpreta a John Holland en la película.
Waveney Lee hace el papel de Marcia Holland.
Charles Carson hace el papel de Robert Holland.
Junia Crawford hace el papel de Susan.
Henry B. Longhurst interpreta a Club Member (as Henry Longhurst) en la película.
Roger Maxwell hace el papel de Club Member.
Gerald Case interpreta a Club Member en la película.
Donald Bisset interpreta a Club Member en la película.
Desmond Roberts interpreta a Club Member en la película.
Reginald Smith interpreta a Club Steward en la película.
MacDonald Parke interpreta a Jason Parrish (as Macdonald Parke) en la película.
Mavis Villiers interpreta a Adele Parrish en la película.
Ernest Clark interpreta a Cmdr. Bates en la película.
Alexander Archdale hace el papel de Local Doctor (uncredited).
Basil Dignam hace el papel de Lt. Cmdr. Evans at P.R.O. (uncredited).
Mabel Etherington interpreta a Nightclub Patron (uncredited) en la película.
Gordon Harris hace el papel de 2nd Special Branch Man Jones (uncredited).
Barbara Hicks interpreta a Miss Price (uncredited) en la película.
John Horsley interpreta a 1st Editor (uncredited) en la película.
Frederick Kelsey hace el papel de Club Member (uncredited).
John Le Mesurier interpreta a Head of the Admiralty (uncredited) en la película.
Ronald Leigh-Hunt interpreta a 2nd Editor (uncredited) en la película.
Richard Marner interpreta a Russian Officer Cornered by Max Easton (uncredited) en la película.
William Mervyn interpreta a Capt. Balfour (uncredited) en la película.
Andre Mikhelson interpreta a 2nd Russian Officer (uncredited) en la película.
John More hace el papel de American General at Embassy Party (uncredited).
Dickie Owen hace el papel de 2nd Policeman (uncredited).
Frederick Piper interpreta a Hall Porter (uncredited) en la película.
Pat Ryan hace el papel de Nightclub Patron (uncredited).
Stanley Zevic hace el papel de 1st Russian Officer (uncredited).
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