Characters played by Robert Preston
John Graham
Characters played by Elizabeth Sellars
Carol Reece Graham
Characters played by Colin Tapley
Inspector Davis
Characters played by Sheila Burrell
Lorna Dawson
Characters played by Harold Lang
Mickie Fraser - Kid Python
Characters played by Mary Germaine
Peggy Reece
Characters played by Thomas Heathcote
Jackie
Characters played by George Woodbridge
Sergeant Ritchie
Characters played by Lyn Evans
Chuck Peters
Characters played by Edith Sharpe
Mrs. Reece
Characters played by James Mills
Thompson
Characters played by Daphne Anderson
Kate
Characters played by Edward Lexy
Cardew
Characters played by Noel Howlett
Johnson
Characters played by Robert Brown
Carter - Scotland Yard
Characters played by Charles Saynor
Constable
Characters played by Gerald Case
Doctor
Characters played by Frederic Steger
Porter
Characters played by Stanley Baker
Milkman
Characters played by Martin Boddey
Desk Sergeant
Characters played by Reg Thomason
Code Breaker