- Alastair Sim
- Samuel Blight
- Barry K. Barnes
- Larry Preston
- Diana Churchill
- Janet Preston
- Edward Chapman
- Detective Inspector Bray
- Ruby Miller
- Mrs. Honeycombe
- Austin Trevor
- Heinreks
- Leo Genn
- Another Agent
- Geoffrey Sumner
- Detective Delacroix
- Glen Alyn
- Agent Posing as Reporter
- Torin Thatcher
- Karl Bergsen
- Carl Jaffe
- Foreign Agent
- Cathleen Nesbitt
- Miss. Sampson
- Cyril Smith
- Barber
- James Harcourt
- Judge
