Season 1 CBS , 1972 - 1973 Watch now Season 2 CBS , 1973 - 1974 Watch now Season 3 CBS , 1974 - 1975 Watch now Season 4 CBS , 1975 - 1976 Watch now Season 5 CBS , 1976 - 1977 Watch now Season 6 CBS , 1977 - 1978 Watch now Season 7 CBS , 1978 - 1979 Watch now Season 8 CBS , 1979 - 1980 Watch now Season 9 CBS , 1980 - 1981 Watch now
, 1972 - 1973
, 1973 - 1974
, 1974 - 1975
, 1975 - 1976
, 1976 - 1977
, 1977 - 1978
, 1978 - 1979
, 1979 - 1980
, 1980 - 1981
