นักแสดง
Oliver Johnston
Minister
Peter Barkworth
Sub Lt. Brown
Desmond Roberts
Club Member
Barbara Hicks
Miss Price (uncredited)
John Le Mesurier
Head of the Admiralty (uncredited)
MacDonald Parke
Jason Parrish (as Macdonald Parke)
Mavis Villiers
Adele Parrish
James Mason
Cmdr. Max Easton
Vera Miles
Virginia Killain
Richard Marner
Russian Officer Cornered by Max Easton (uncredited)
Robert Flemyng
Cmdr. John Larkin
Ernest Clark
Cmdr. Bates
Gordon Harris
2nd Special Branch Man Jones (uncredited)
George Sanders
Sir Charles Holland
Martin Stephens
John Holland
Junia Crawford
Susan
John Horsley
1st Editor (uncredited)
William Mervyn
Capt. Balfour (uncredited)
Duncan Lamont
1st Special Branch man Gregson
Rachel Gurney
Clara Holland
Charles Carson
Robert Holland
Donald Bisset
Club Member
Harry Andrews
Capt. Graham
Basil Dignam
Lt. Cmdr. Evans at P.R.O. (uncredited)
Roger Maxwell
Club Member
Ronald Leigh-Hunt
2nd Editor (uncredited)
Frederick Piper
Hall Porter (uncredited)
Pat Ryan
Nightclub Patron (uncredited)