Season 1 NBC , 1962 - 1963 Season 2 NBC , 1963 Season 3 NBC , 1964 - 1965 Season 4 NBC , 1965 Season 5 NBC , 1966 Season 6 NBC , 1968 Season 7 NBC , 1968 - 1969 Season 8 NBC , 1962 - 1969