<P> The regular series was preceded by the two - hour pilot movie, which first aired on March 30, 1974 . The series began on the NBC network on September 11, 1974, and ended on May 10, 1982 . </P> <P> The majority of the episodes run approximately 50 minutes (not counting commercials, they have since been edited for syndication to accommodate more commercial time). Expanded episodes (90 minutes to 2 hours) have been indicated as such; many of these may not currently be shown in determined areas due to their length . </P> <Table> <Tr> <Th_colspan="2"> Season </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 11, 1974 (1974 - 09 - 11) </Td> <Td> May 7, 1975 (1975 - 05 - 07) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> September 10, 1975 (1975 - 09 - 10) </Td> <Td> March 31, 1976 (1976 - 03 - 31) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> September 27, 1976 (1976 - 09 - 27) </Td> <Td> April 4, 1977 (1977 - 04 - 04) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> September 12, 1977 (1977 - 09 - 12) </Td> <Td> March 13, 1978 (1978 - 03 - 13) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 5 </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 11, 1978 (1978 - 09 - 11) </Td> <Td> March 19, 1979 (1979 - 03 - 19) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 6 </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 17, 1979 (1979 - 09 - 17) </Td> <Td> May 12, 1980 (1980 - 05 - 12) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 7 </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> September 22, 1980 (1980 - 09 - 22) </Td> <Td> May 11, 1981 (1981 - 05 - 11) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 8 </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> October 5, 1981 (1981 - 10 - 05) </Td> <Td> May 10, 1982 (1982 - 05 - 10) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 9 </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> September 27, 1982 (1982 - 09 - 27) </Td> <Td> March 21, 1983 (1983 - 03 - 21) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> Movies </Td> <Td_colspan="2"> </Td> <Td_colspan="1"> December 12, 1983 (1983 - 12 - 12) </Td> <Td> February 6, 1984 (1984 - 02 - 06) </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Season </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> </Tr>

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