Z-Cars further spin-off entitled "Second Verdict" in which Barlow and Watt looked into unsolved cases and unsafe convictions. Frank Windsor made a final appearance as Watt in the last episode of "Z-Cars", "Pressure", in September 1978, with Robins (John Phillips), the Detective Chief Superintendent from the original series who had risen to chief constable. Jeremy Kemp, Brian Blessed, Joseph Brady and Colin Welland also appeared, though not as their original characters. "Z-Cars" is incomplete in the archives. The period 1962–65 is reasonably well represented; though with big gaps. With the 1967–71 sixth series, when the programme was shown almost every week,
Mark Jones (actor) Mark Jones (actor) Mark Jones (22 April 1939 – 14 January 2010) was an English actor, who appeared frequently in various films and television series. Credits include: "A Family at War", "Z-Cars", "Van der Valk", "Doctor Who" (in the serial "The Seeds of Doom"), "The New Avengers", "The Onedin Line", "Target", "Secret Army", "Tales of the Unexpected", "Buccaneer", "Blott on the Landscape", "Casualty", "Call Me Mister" and "Dempsey and Makepeace". He also appeared in the films "Tell Me Lies" (1968), "Connecting Rooms" (1970), "Under Milk Wood" (1972), "Layout for 5 Models" (1972), "Keep It Up, Jack" (1973, title role), "The