- Writer:
- Francis Durbridge
- Producer:
- Martyn C. Webster
- Paul Temple:
- Carl Bernard
- Steve:
- Bernadette Hodgson
- Sir Graham Forbes:
- Lester Mudditt
- Superintendent Bradley:
- Godfrey Baseley
- Inspector Ross:
- Edgar Norfolk
- Hart:
- Hal Bryant
- Banks:
- Philip Garston-Jones
- Sir Felix Reybourn:
- Ronald Simpson
- Mrs Clarence:
- Mabel France
- Roger Storey:
- Sydney Tafler
- Pryce:
- David Compton