- Author:
- Michael Pertwee
- Adapted for broadcasting by:
- Peggy Wells
- Production:
- Martyn C. Webster
- Dr Glanville:
- Ivan Samson
- A radio announcer:
- James Thomason
- Emily Raynor, Martin's mother:
- Susan Richmond
- Kate, a maid:
- Janet Morrison
- Cooper, a reporter:
- Michael Turner
- Sally Raynor:
- Belle Chrystall
- Dr John Harper:
- Richard Hurndall
- Martin Raynor:
- Richard Williams
