- Unknown:
- Francis Durbridge
- Unknown:
- Roger Shelly
- Produced By:
- Martyn C. Webster
- Paul Temple:
- Peter Coke
- Steve:
- Marjorie Westbury
- Sir Graham Forbes:
- Richard Williams
- Inspector Eden:
- Frederick Treves
- Terry Palmer:
- Peter Wilde
- Mary Desmond:
- June Tobin
- Bill McCall:
- John Scott
- Roger Shelly:
- Richard Hurndall
- Philip Droste:
- Simon L,ack
- Telephone Operator:
- Betty Baskcomb
- Louis Franz:
- Rolf Lefebvre
- Charlie:
- James Beattie
- Dr Foy:
- John Graham
