- Kirk Douglas
- Rolf
- Richard Harris
- Knut Strand
- Ulla Jacobsson
- Anna
- Michael Redgrave
- Uncle
- David Weston
- Arne
- Sebastian Breaks
- Gunnar
- John Golightly
- Freddy
- Alan Howard
- Oli
- Patrick Jordan
- Henrik
- William Marlowe
- Claus
- Brook Williams
- Einar
- Roy Dotrice
- Jensen
- Anton Diffring
- Major Frick
- Ralph Michael
- Nilssen
- Eric Porter
- Terboven
- Wolf Frees
- Knippelberg
- Karel Stepanek
- Hartmuller
- Gerard Heinz
- Erhardt
- Victor Beaumont
- German Sergeant
- George Murcell
- Sturmfuhrer
- Mervyn Johns
- Col. Wilkinson
- Barry Jones
- Professor Logan
- Geoffrey Keen
- General Bolt
- Robert Ayres
- General Courts
- Jennifer Hilary
- Sigrid
- Maurice Denham
- Doctor
- David Davies
- Captain of 'Galtesund'
- Philo Hauser
- Businessman
- Faith Brook
- Woman On Bus
- Elvi Hale
- Mrs. Sandersen
- Russell Waters
- Mr. Sandersen
- Jan Conrad
- Watchman In Factory
- Annette Andre
- Girl Student
- Grace Arnold
- Passenger on 'Galtesund'
- Robert Bruce
- Major
- Robin Burns
- Hostage
- Pamela Conway
- Girl in Darkroom
- David Crane
- Detector Van Radio Operator
- Fred Davis
- Officer Outside Briefing Room
- Howard Douglas
- Passenger on 'Galtesund'
- Joe Dunne
- German Ferry Guard
- Vera Goulet
- Passenger on 'Galtesund
- Paul Hansard
- German Official
- George Holdcroft
- Adjutant
- Max Howard
- Child on Ferry
- Jemma Hyde
- Female Passenger on Galtesund
- Brian Jackson
- Norwegian Naval Attache
- Anthony Lang
- Hostage
- John Moulder-Brown
- (uncredited)
- Cecil Paul
- Officer at Briefing
- Terence Plummer
- Quisling
- Joe Powell
- Quisling
- George Roubicek
- Soldier Operating Radio Direction Finder
- Jack Taylor
- German Soldier Escorting Bus
- Fred Wood
- Saboteur
