<Table> <Tr> <Th> Name </Th> <Th_colspan="3"> Release dates </Th> <Th> No. of episodes </Th> <Th> Additional Information </Th> </Tr> <Tr> <Th> Region 1 </Th> <Th> Region 2 </Th> <Th> Region 4 </Th> </Tr> <Tr> <Td> The Complete First Season </Td> <Td> September 2, 2008 </Td> <Td> January 12, 2009 </Td> <Td> April 3, 2009 </Td> <Td> 17 </Td> <Td> <Ul> <Li> 3 - disc box set </Li> <Li> "Quantum Mechanics of The Big Bang Theory: Series Cast and Creators on Why It's Cool to Be a Geek". </Li> <Li> Gag reel (Blu - ray exclusive) </Li> </Ul> </Td> </Tr> <Tr> <Td> The Complete Second Season </Td> <Td> September 15, 2009 </Td> <Td> October 19, 2009 </Td> <Td> March 3, 2010 </Td> <Td> 23 </Td> <Td> <Ul> <Li> 4 - disc box set </Li> <Li> Gag reel </Li> <Li> "Physicist to the Stars: Real - Life Physicist / UCLA professor David Saltzberg's consulting relationship to the Show" </Li> <Li> "Testing the Infinite Hilarity Hypothesis in relation to the Big Bang Theory: Season 2's Unique Characters and Characteristics" </Li> </Ul> </Td> </Tr> <Tr> <Td> The Complete Third Season </Td> <Td> September 14, 2010 </Td> <Td> September 27, 2010 </Td> <Td> October 13, 2010 </Td> <Td> 23 </Td> <Td> <Ul> <Li> 3 - disc box set </Li> <Li> Set tour with Simon Helberg and Kunal Nayyar </Li> <Li> Inside look on the third season </Li> <Li> Gag reel </Li> </Ul> </Td> </Tr> <Tr> <Td> The Complete Fourth Season </Td> <Td> September 13, 2011 </Td> <Td> September 26, 2011 </Td> <Td> October 5, 2011 </Td> <Td> 24 </Td> <Td> <Ul> <Li> 3 - disc box set </Li> <Li> Story of show's theme song with Barenaked Ladies </Li> <Li> Music video for the theme song </Li> <Li> Cast interviews </Li> <Li> Gag reel </Li> </Ul> </Td> </Tr> <Tr> <Td> The Complete Fifth Season </Td> <Td> September 11, 2012 </Td> <Td> September 3, 2012 </Td> <Td> October 3, 2012 </Td> <Td> 24 </Td> <Td> <Ul> <Li> 3 - disc box set </Li> <Li> "The Big Bang Theory at 100" </Li> <Li> "The Big Bang Theory's Laws of Reflection" </Li> <Li> "Professors of Production" </Li> <Li> Gag reel </Li> </Ul> </Td> </Tr> <Tr> <Td> The Complete Sixth Season </Td> <Td> September 10, 2013 </Td> <Td> September 2, 2013 </Td> <Td> October 11, 2013 </Td> <Td> 24 </Td> <Td> <Ul> <Li> 3 - disc box set </Li> <Li> "The Big Bang Theory: The Final Comedy Frontier" </Li> <Li> "Houston, We Have a Sitcom" </Li> <Li> "Electromagnetism: The Best Relationship Moments" </Li> <Li> "The Big Bang Theory at Paleyfest 2013" </Li> <Li> Gag reel </Li> </Ul> </Td> </Tr> <Tr> <Td> The Complete Seventh Season </Td> <Td> September 16, 2014 </Td> <Td> September 8, 2014 </Td> <Td> September 17, 2014 </Td> <Td> 24 </Td> <Td> <Ul> <Li> String Theory Serenade </Li> <Li> James Earl Jones: The Un-Conventional Guest Star </Li> <Li> BBTea Time </Li> <Li> The Big Bang Theory's May the 4th </Li> <Li> The Convention Conundrum </Li> <Li> The Big Cendrowski </Li> <Li> 2013 Comic - Con Panel </Li> <Li> Gag Reel </Li> </Ul> </Td> </Tr> <Tr> <Td> The Complete Eighth Season </Td> <Td> September 15, 2015 </Td> <Td> September 14, 2015 </Td> <Td> September 16, 2015 </Td> <Td> 24 </Td> <Td> <Ul> <Li> Shooting Stars: BBT on BBT </Li> <Li> 2014 The Big Bang Theory Comic - Con Panel </Li> <Li> Constellation Prize </Li> <Li> Here's To You, Carol Ann Susi </Li> <Li> It's A Quark...It's An Atom...It's the #BBTSuperfans! </Li> <Li> Gag Reel </Li> </Ul> </Td> </Tr> <Tr> <Td> The Complete Ninth Season </Td> <Td> September 13, 2016 </Td> <Td> August 29, 2016 </Td> <Td> August 31, 2016 </Td> <Td> 24 </Td> <Td> <Ul> <Li> The Big Bang Theory Gives Back </Li> <Li> BBT: The Big 200! </Li> <Li> Love IS Rocket Science </Li> <Li> Just Ask BBT: If I Had To Go To Mars...</Li> <Li> Just Ask BBT: Who Will Get The Couch? </Li> <Li> 2015 Comic - Con Panel </Li> <Li> Gag Reel </Li> </Ul> </Td> </Tr> </Table> <Tr> <Th> Name </Th> <Th_colspan="3"> Release dates </Th> <Th> No. of episodes </Th> <Th> Additional Information </Th> </Tr> <Tr> <Th> Region 1 </Th> <Th> Region 2 </Th> <Th> Region 4 </Th> </Tr> <Tr> <Td> The Complete First Season </Td> <Td> September 2, 2008 </Td> <Td> January 12, 2009 </Td> <Td> April 3, 2009 </Td> <Td> 17 </Td> <Td> <Ul> <Li> 3 - disc box set </Li> <Li> "Quantum Mechanics of The Big Bang Theory: Series Cast and Creators on Why It's Cool to Be a Geek". </Li> <Li> Gag reel (Blu - ray exclusive) </Li> </Ul> </Td> </Tr>

When does the next episode of the big bang theory come out