Season 1 Syndication , 1969 - 1970 Watch now Season 2 Syndication , 1970 - 1971 Season 3 Syndication , 1971 - 1972 Season 4 Syndication , 1972 - 1973 Season 5 Syndication , 1973 - 1974 Season 6 Syndication , 1974 - 1975 Season 7 Syndication , 1975 - 1976 Season 8 Syndication , 1976 - 1977 Season 9 Syndication , 1977 - 1978 Season 10 Syndication , 1978 - 1979 Watch now Season 11 Syndication , 1979 - 1980 Watch now Season 12 Syndication , 1980 - 1981 Season 13 Syndication , 1981 - 1982 Watch now Season 14 Syndication , 1982 - 1983 Season 15 Syndication , 1938 - 1984 Season 21 Syndication , 1990 Season 23 Syndication , 1992