Question: when did the first episode of columbo air
Answer: Season Episodes Originally aired First aired Last aired Network Pilots February 20 , 1968 ( 1968 - 02 - 20 ) March 1 , 1971 ( 1971 - 03 - 01 ) NBC 7 September 15 , 1971 ( 1971 - 09 - 15 ) February 9 , 1972 ( 1972 - 02 - 09 ) 8 September 17 , 1972 ( 1972 - 09 - 17 ) March 25 , 1973 ( 1973 - 03 - 25 ) 8 September 23 , 1973 ( 1973 - 09 - 23 ) May 5 , 1974 ( 1974 - 05 - 05 ) 6 September 15 , 1974 ( 1974 - 09 - 15 ) April 27 , 1975 ( 1975 - 04 - 27 ) 5 6 September 14 , 1975 ( 1975 - 09 - 14 ) May 2 , 1976 ( 1976 - 05 - 02 ) 6 October 10 , 1976 ( 1976 - 10 - 10 ) May 22 , 1977 ( 1977 - 05 - 22 ) 7 5 N