<P> On March 25, 2016, it was renewed for an eighth season, which premiered on September 25, 2016 . CBS aired the first two hours of the season together and called it Episode 1 . </P> <P> As of October 29, 2017, 197 original episodes of the series have aired; currently airing its ninth season . On March 23, 2017, CBS renewed the series for a ninth season . </P> <Table> <Tr> <Th_colspan="2"> Season </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> <Th_colspan="2"> Nielsen ratings </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> <Th> Rank </Th> <Th> Rating </Th> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> Intro </Td> <Td_colspan="2"> </Td> <Td_colspan="1"> April 28, 2009 (2009 - 04 - 28) </Td> <Td> May 5, 2009 (2009 - 05 - 05) </Td> <Td> N / A </Td> <Td> N / A </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 22, 2009 (2009 - 09 - 22) </Td> <Td> May 25, 2010 (2010 - 05 - 25) </Td> <Td> 8 </Td> <Td> 9.8 (Tied with Undercover Boss) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 21, 2010 (2010 - 09 - 21) </Td> <Td> May 17, 2011 (2011 - 05 - 17) </Td> <Td> 7 </Td> <Td> 10.1 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 20, 2011 (2011 - 09 - 20) </Td> <Td> May 15, 2012 (2012 - 05 - 15) </Td> <Td> 7 </Td> <Td> 10.2 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 25, 2012 (2012 - 09 - 25) </Td> <Td> May 14, 2013 (2013 - 05 - 14) </Td> <Td> </Td> <Td> 11.0 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 5 </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 24, 2013 (2013 - 09 - 24) </Td> <Td> May 13, 2014 (2014 - 05 - 13) </Td> <Td> </Td> <Td> 10.3 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 6 </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 29, 2014 (2014 - 09 - 29) </Td> <Td> May 18, 2015 (2015 - 05 - 18) </Td> <Td> 22 </Td> <Td> 7.6 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 7 </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 21, 2015 (2015 - 09 - 21) </Td> <Td> May 2, 2016 (2016 - 05 - 02) </Td> <Td> 21 </Td> <Td> 7.1 (Tied with Blindspot and The Good Wife) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 8 </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 25, 2016 (2016 - 09 - 25) </Td> <Td> May 14, 2017 (2017 - 05 - 14) </Td> <Td> 10 </Td> <Td> 7.8 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 9 </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> October 1, 2017 (2017 - 10 - 01) </Td> <Td> TBA </Td> <Td> TBA </Td> <Td> TBA </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Season </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> <Th_colspan="2"> Nielsen ratings </Th> </Tr>

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