Season 14, Episode 1 | 4 parts | First broadcast: 4–25 September 1976 […]
Season 13, Episode 1 | 4 parts | First broadcast: 30 August – […]
Season 11, Episode 1 | 4 parts | First broadcast: 15 December 1973 […]
Season 10, Episode 1 | 4 parts | First broadcast: 30 December 1972 […]
Season 9, Episode 1 | 4 parts | First broadcast: 1–22 January 1972 […]
Season 8, Episode 1 | 4 parts | First broadcast: 2–23 January 1971 […]
Season 7, Episode 1 | 4 parts | First broadcast: 3–24 January 1970 […]
Season 6, Episode 1 | 5 parts | First broadcast: 10 August – […]
Season 5, Episode 1 | 4 parts | First broadcast: 2–16 September 1967 […]