- Unknown:
- Laurence Kitchin.
- Produced By:
- Hugh Stewart
- Blane:
- Peter Cushing
- Teresa:
- Maxine Audley
- Sister:
- Valerie Whitehouse
- Harper:
- Alan Reid
- Taff:
- Basil Jones
- Major:
- Bruno Barnabe
- Mother:
- Vivienne Chatterton
- Boy:
- Roland Andrea
- Intelligence Officer:
- Graham Doody