- Adapted By:
- Ronald Barton
- Novel By:
- G. K. Chesterton
- Composed By:
- Denis Moonan
- Produced By:
- Peter Watts
- Unknown:
- Edward Brandon.
- Unknown:
- Ann Codrington
- Unknown:
- Vernon Gibb.
- Unknown:
- Peter Mizen
- Unknown:
- Bryan Powley.
- Unknown:
- Raf de la Torre
- Unknown:
- Patrick Crean
- Unknown:
- Marcel Poncin
- Gabriel Syme (Thursday):
- Ronald Barton
- Lucian Gregory:
- Heron Carvic
- Mr Buttons:
- Stanley Drewitt
- A Policeman:
- Leslie Handford
- The Secretary (Monday):
- Malcolm Hayes
- Sunday Cecil Trouncer ' The Marquis de St Eustache' (Wednesday) Abraham Sofaer ' Comrade Gogol ' (Tuesday):
- Lionel Stevens
- Dr Bull (Saturday):
- Charles Leno
- ' Professor de Worms (Friday):
- Alexander' Sarner
- The Ambassador:
- Deryck Guyler
- The Valet:
- David Enders
