Season 1 ABC , 1960 - 1961 Watch now Season 2 ABC , 1961 - 1962 Watch now Season 3 ABC , 1962 - 1963 Watch now Season 4 ABC , 1963 - 1964 Watch now Season 5 ABC , 1964 - 1965 Watch now Season 6 CBS , 1965 - 1966 Watch now Season 7 CBS , 1966 - 1967 Watch now Season 8 CBS , 1967 - 1968 Watch now Season 9 CBS , 1968 - 1969 Watch now Season 10 CBS , 1969 - 1970 Watch now Season 11 CBS , 1970 - 1971 Watch now Season 12 CBS , 1971 - 1972 Watch now