<P> Elementary is an American crime drama created by Robert Doherty and loosely based on Sherlock Holmes and other characters appearing in the works of Sir Arthur Conan Doyle . The series stars Jonny Lee Miller, Lucy Liu, Aidan Quinn, and Jon Michael Hill and premiered on CBS on September 27, 2012 . On May 11, 2015, the series was renewed for a fourth season, which premiered on November 5, 2015 . On March 25, 2016, it was renewed for a fifth season, which premiered on October 2, 2016 . On May 13, 2017, it was renewed for a sixth season of 13 episodes, which was later extended to 21 episodes . </P> <P> As of May 21, 2017, 120 episodes of Elementary have aired, concluding the fifth season . </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 27, 2012 (2012 - 09 - 27) </Td> <Td> May 16, 2013 (2013 - 05 - 16) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 26, 2013 (2013 - 09 - 26) </Td> <Td> May 15, 2014 (2014 - 05 - 15) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> October 30, 2014 (2014 - 10 - 30) </Td> <Td> May 14, 2015 (2015 - 05 - 14) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> November 5, 2015 (2015 - 11 - 05) </Td> <Td> May 8, 2016 (2016 - 05 - 08) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 5 </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> October 2, 2016 (2016 - 10 - 02) </Td> <Td> May 21, 2017 (2017 - 05 - 21) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 6 </Td> <Td_colspan="2"> 21 </Td> <Td_colspan="1"> April 30, 2018 (2018 - 04 - 30) </Td> <Td> TBA </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Season </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> </Tr>

How many episodes of elementary have there been
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