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- Season 9 overviewSep 21, 2015-May 12, 201624 episodesSeason 9 episodes1. The Matrimonial Momentum Sep 21, 2015
- Penny must decide if she can get past Leonard's bad behavior.
- 2. The Separation Oscillation Sep 28, 2015
- Leonard tries to ease Penny's mind; Sheldon plans a special episode of "Fun With Flags."
- 3. The Bachelor Party Corrosion Oct 5, 2015
- A flat tire during Leonard's bachelor party weekend in Mexico tests the guys' skills.
- 4. The 2003 Approximation Oct 12, 2015
- An impending change inspires Sheldon to revert to 2003, before he met Penny and Leonard.
- 5. The Perspiration Implementation Oct 19, 2015
- Barry Kripke expresses interest in Amy while leading a fencing lesson for the guys.
- 6. The Helium Insufficiency Oct 26, 2015
- Leonard and Sheldon try to secure the helium they need during a nation-wide shortage.
- 7. The Spock Resonance Nov 5, 2015
- Sheldon struggles to keep his emotions in check when he is interviewed for a documentary.
- 8. The Mystery Date Observation Nov 12, 2015
- Sheldon, Wolowitz and Koothrappali post an ad online to find a new girlfriend for Sheldon.
- 9. The Platonic Permutation Nov 19, 2015
- Amy and Sheldon spend Thanksgiving at the aquarium -- as friends.
- 10. The Earworm Reverberation Dec 10, 2015
- Sheldon has a song stuck in his head; despite their awkward date, Amy asks Dave over for dinner.
- 11. The Opening Night Excitation Dec 17, 2015
- After dating for more than five years, Amy and Sheldon spend the night together for the first time.
- 12. The Sales Call Sublimination Jan 7, 2016
- Leonard meets with a psychiatrist; Wolowitz and Bernadette struggle when Stuart moves out.
- 13. The Empathy Optimization Jan 14, 2016
- Leonard, Penny and the gang attempt to treat themselves to a Sheldon-free weekend.
- 14. The Meemaw Materialization Feb 4, 2016
- Sheldon's excitement about his Meemaw's visit fades when she butts heads with Amy.
- 15. The Valentino Submergence Feb 11, 2016
- Amy and Sheldon host a Valentine's Day edition of Fun With Flags; Raj is torn between two women.
- 16. The Positive Negative Reaction Feb 18, 2016
- The gang celebrates news of Bernadette's pregnancy by singing karaoke.
- 17. The Celebration Experimentation Feb 25, 2016
- For the first time in nine years, the gang celebrates Sheldon's birthday.
- 18. The Application Deterioration Mar 10, 2016
- The guys file for a patent on their invention; the girls give dating advice to Koothrappali.
- 19. The Solder Excursion Diversion Mar 31, 2016
- Sheldon makes a revelation when Amy buys him a new laptop; Leonard and Wolowitz lie to their wives.
- 20. The Big Bear Precipitation Apr 7, 2016
- Sheldon shares a secret about Leonard when they go on a weekend trip with Penny and Amy.
- 21. The Viewing Party Combustion Apr 21, 2016
- The gang must choose sides when an argument between Sheldon and Leonard turns into a heated debate.
- 22. The Fermentation Bifurcation Apr 28, 2016
- The gang runs into Penny's ex while out at a wine bar; Bernadette spends an evening with Sheldon.
- 23. The Line Substitution Solution May 5, 2016
- Sheldon wants to go to a movie screening, so he pays Stuart to spend the day with Amy.
- 24. The Convergence Convergence May 12, 2016
- Leonard's recently divorced parents and Sheldon's devoutly religious mother visit.