Characters played by John Bentley
Paul Temple
Characters played by Dinah Sheridan
Steve Temple
Characters played by Jack Livesey
Sir Graham Forbes
Characters played by Beatrice Varley
Mrs. Weston
Characters played by Barbara Couper
Mrs. Morgan
Characters played by Jenny Mathot
Jacqueline Giraud
Characters played by Andrew Leigh
Professor Hardwick
Characters played by Hugh Dempster
Oliver Ffollett
Characters played by Dino Galvani
Van Draper
Characters played by Ivan Samson
Major Murray
Characters played by Bruce Seton
Bill Bryant
Characters played by Leo de Pokorny
Dr. Steiner
Characters played by Michael Brennan
Hammond
Characters played by Joseph O'Conor
Inspector Crane
Characters played by Shaym Bahadur
Rikki
Characters played by Gerald Rex
Ernie
Characters played by Ben Williams
Mr. Weston
Characters played by Anne Hayes
Celia Hardwick
Characters played by Peter Butterworth
Post Office Engineer
Characters played by Hamilton Keene
An Interested Visitor
Characters played by Frederick Morant
Doctor
Characters played by Jean Packer
Nurse
Characters played by Dennis Val Norton
1st Gangster
Characters played by Michael Hogarth
2nd Gangster