Guest Stars Julian Glover as Barton Peter Sallis as Dr. Jervis Michael Harding as Ticket Collector Keith Taylor as Fierce Little Man George Innes as Adolph Schonberg Graham Seed as Porter Barrie Ingham as Dr. John Thorndyke Nicholas Selby as Superintendent Miller Max Faulkner as Mounted Policeman Derek Smith as Professor Popplebaum Eric McCaine as Inspector Badger Peter Beton as Mr. James (Reporter) Clive Rogers as Victim