<P> Supernatural is an American supernatural drama television series, created by Eric Kripke, that follows brothers Sam (Jared Padalecki) and Dean Winchester (Jensen Ackles) as they travel throughout the United States hunting supernatural creatures . The series borrows heavily from folklore and urban legends, and explores Pagan mythology and Christian theology, and their main adversaries throughout the series are demons . </P> <P> The series premiered on September 13, 2005 on The WB . The first season was broadcast on The WB, and following The WB's merger with UPN in September 2006, Supernatural continued to be aired on the new network, The CW . The first eleven seasons are available on DVD in Regions 1, 2, and 4 and are also available on Blu - ray . As of May 18, 2017, 264 episodes of Supernatural have aired, concluding the twelfth season . In January 2017, The CW renewed the series for a thirteenth season, which will premiere on October 12, 2017 . </P> <Table> <Tr> <Th_colspan="2"> Season </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="3"> Originally aired </Th> <Th_colspan="2"> Nielsen ratings </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> <Th> Network </Th> <Th> Rank </Th> <Th> Average viewership (in millions) </Th> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> September 13, 2005 (2005 - 09 - 13) </Td> <Td> May 4, 2006 (2006 - 05 - 04) </Td> <Td> The WB </Td> <Td> 165 </Td> <Td> 3.81 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> September 28, 2006 (2006 - 09 - 28) </Td> <Td> May 17, 2007 (2007 - 05 - 17) </Td> <Td> The CW </Td> <Td> 216 </Td> <Td> 3.14 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 16 </Td> <Td_colspan="1"> October 4, 2007 (2007 - 10 - 04) </Td> <Td> May 15, 2008 (2008 - 05 - 15) </Td> <Td> 187 </Td> <Td> 2.74 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> September 18, 2008 (2008 - 09 - 18) </Td> <Td> May 14, 2009 (2009 - 05 - 14) </Td> <Td> 161 </Td> <Td> 3.14 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 5 </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> September 10, 2009 (2009 - 09 - 10) </Td> <Td> May 13, 2010 (2010 - 05 - 13) </Td> <Td> 125 </Td> <Td> 2.64 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 6 </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> September 24, 2010 (2010 - 09 - 24) </Td> <Td> May 20, 2011 (2011 - 05 - 20) </Td> <Td> 209 </Td> <Td> 2.42 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 7 </Td> <Td_colspan="2"> 23 </Td> <Td_colspan="1"> September 23, 2011 (2011 - 09 - 23) </Td> <Td> May 18, 2012 (2012 - 05 - 18) </Td> <Td> 176 </Td> <Td> 2.03 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 8 </Td> <Td_colspan="2"> 23 </Td> <Td_colspan="1"> October 3, 2012 (2012 - 10 - 03) </Td> <Td> May 15, 2013 (2013 - 05 - 15) </Td> <Td> 152 </Td> <Td> 2.52 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 9 </Td> <Td_colspan="2"> 23 </Td> <Td_colspan="1"> October 8, 2013 (2013 - 10 - 08) </Td> <Td> May 20, 2014 (2014 - 05 - 20) </Td> <Td> 141 </Td> <Td> 2.81 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 10 </Td> <Td_colspan="2"> 23 </Td> <Td_colspan="1"> October 7, 2014 (2014 - 10 - 07) </Td> <Td> May 20, 2015 (2015 - 05 - 20) </Td> <Td> 156 </Td> <Td> 2.02 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 11 </Td> <Td_colspan="2"> 23 </Td> <Td_colspan="1"> October 7, 2015 (2015 - 10 - 07) </Td> <Td> May 25, 2016 (2016 - 05 - 25) </Td> <Td> 131 </Td> <Td> 2.81 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 12 </Td> <Td_colspan="2"> 23 </Td> <Td_colspan="1"> October 13, 2016 (2016 - 10 - 13) </Td> <Td> May 18, 2017 (2017 - 05 - 18) </Td> <Td> 132 </Td> <Td> 2.62 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 13 </Td> <Td_colspan="2"> 23 </Td> <Td_colspan="1"> October 12, 2017 (2017 - 10 - 12) </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="3"> Originally aired </Th> <Th_colspan="2"> Nielsen ratings </Th> </Tr>

When did season 13 of supernatural come out