<Tr> <Th> 156 </Th> <Td> </Td> <Td> "Cutting Losses" </Td> <Td> David M. Barrett </Td> <Td> Siobhan Byrne O'Connor </Td> <Td> September 29, 2017 (2017 - 09 - 29) </Td> <Td> 801 </Td> <Td> TBD </Td> </Tr> <Tr> <Th> 157 </Th> <Td> </Td> <Td> "Ghosts of the Past" </Td> <Td> TBA </Td> <Td> TBA </Td> <Td> October 6, 2017 (2017 - 10 - 06) </Td> <Td> TBA </Td> <Td> TBD </Td> </Tr> <Tr> <Th> 158 </Th> <Td> </Td> <Td> "The Enemy of My Enemy" </Td> <Td> TBA </Td> <Td> TBA </Td> <Td> October 13, 2017 (2017 - 10 - 13) </Td> <Td> TBA </Td> <Td> TBD </Td> </Tr> <Table> <Tr> <Th> Season </Th> <Th> Episodes </Th> <Th_colspan="4"> DVD release dates </Th> </Tr> <Tr> <Th> Region 1 </Th> <Th> Region 2 </Th> <Th> Region 4 </Th> <Th> Discs </Th> </Tr> <Tr> <Td> </Td> <Td> 22 </Td> <Td> September 13, 2011 (2011 - 09 - 13) </Td> <Td> September 19, 2011 (2011 - 09 - 19) </Td> <Td> September 15, 2011 (2011 - 09 - 15) </Td> <Td> 6 </Td> </Tr> <Tr> <Td> </Td> <Td> 22 </Td> <Td> September 11, 2012 (2012 - 09 - 11) </Td> <Td> October 15, 2012 (2012 - 10 - 15) </Td> <Td> October 17, 2012 (2012 - 10 - 17) </Td> <Td> 6 </Td> </Tr> <Tr> <Td> </Td> <Td> 23 </Td> <Td> September 10, 2013 (2013 - 09 - 10) </Td> <Td> October 13, 2013 (2013 - 10 - 13) </Td> <Td> March 5, 2014 (2014 - 03 - 05) </Td> <Td> 6 </Td> </Tr> <Tr> <Td> </Td> <Td> 22 </Td> <Td> September 9, 2014 (2014 - 09 - 09) </Td> <Td> September 8, 2014 (2014 - 09 - 08) </Td> <Td> January 28, 2015 (2015 - 01 - 28) </Td> <Td> 6 </Td> </Tr> <Tr> <Td> 5 </Td> <Td> 22 </Td> <Td> September 8, 2015 (2015 - 09 - 08) </Td> <Td> October 12, 2015 (2015 - 10 - 12) </Td> <Td> March 24, 2016 (2016 - 03 - 24) </Td> <Td> 6 </Td> </Tr> <Tr> <Td> 6 </Td> <Td> 22 </Td> <Td> September 20, 2016 (2016 - 09 - 20) </Td> <Td> October 17, 2016 (2016 - 10 - 17) </Td> <Td> TBA </Td> <Td> 6 </Td> </Tr> <Tr> <Td> 7 </Td> <Td> 22 </Td> <Td> August 22, 2017 (2017 - 08 - 22) </Td> <Td> TBA </Td> <Td> TBA </Td> <Td> 6 </Td> </Tr> </Table>

What was the last episode of blue bloods