- Director:
- Anthony Mann
- Dr Rolf Pedersen:
- Kirk Douglas
- Knut Straud:
- Richard Harris
- Anna:
- Ulla Jacobsson
- Uncle:
- Michael Redgrave
- Arne:
- David Weston
- Major Frick:
- Anton Diffring
- Terboven:
- Eric Porter
- Colonel Wilkinson:
- Mervyn Johns
- Sigrid:
- Jennifer Hilary
- Jensen, the Mysterious Stranger:
- Roy Dotrice
- Professor Logan:
- Barry Jones
- Nilssen:
- Ralph Michael
- Gunnar:
- Sebastian Breaks
- Freddy:
- John Golightly
- Oli:
- Alan Howard
- Henrik:
- Patrick Jordan
- Claus:
- William Marlowe
- Elinar:
- Brook Williams
- Knippelberg:
- Wolf Frees
- Hartmuller:
- Karel Stepanek
- Erhardt:
- Gerard Heinz
- German sergeant:
- Victor Beaumont
- General Bolt:
- Geoffrey Keen
- General Courts:
- Robert Ayres
- Doctor at hospital:
- Maurice Denham
- Captain of Galtesund:
- David Davies
- Businessman:
- Philo Hauser
- Woman on bus:
- Faith Brook
- Mrs Sandersen:
- Elvi Hale
