 The first twelve episodes were filmed in the United States, at the Hal Roach studios, with the rest being filmed at ITC's traditional home of Elstree.ITC produced a film based on the same source-material, "The Count of Monte-Cristo", in 1975.Guest stars who would go on to later fame included Patrick Troughton, Stratford Johns, Cyril Shaps, Anthony Newlands, John Barrard, Raf De La Torre and Nigel Davenport.