1. The Matrimonial Momentum

Season 9 premiere, Penny has a problem dealing with Leonard's confession about h... More

2. The Separation Oscillation

To ease Penny's mind, Leonard pays a visit to the woman he kissed during his exp... More

3. The Bachelor Party Corrosion

The guys surprise Leonard with a belated bachelor-party weekend in Mexico, but t... More

4. The 2003 Approximation

Sheldon reverts to 2003 when he learns that Leonard and Penny are moving in toge... More

5. The Perspiration Implementation

When Barry Kripke gives the guys fencing lessons, he makes a point of letting Sh... More

6. The Helium Insufficiency

A helium shortage leads Sheldon and Leonard to do business with a dealer in the ... More

7. The Spock Resonance

Sheldon's interview for a "Star Trek" documentary focusing on Spock turns up a s... More

8. The Mystery Date Observation

When Leonard, Penny and Bernadette learn that Amy is going out on a dinner date,... More

9. The Platonic Permutation

Sheldon and Amy spend Thanksgiving at the aquarium, Wolowitz volunteers at a sou... More

10. The Earworm Reverberation

God only knows what song is constantly playing in Sheldon's head, but it reminds... More

11. The Opening Night Excitation

Professor Proton visits Sheldon in a dream and gives him Obi-Wan-like advice abo... More

12. The Sales Call Sublimation

Penny entices Leonard to meet with a psychiatrist, Stuart moves out of the Wolow... More

13. The Empathy Optimization

Dealing with an under-the-weather Sheldon is draining for Penny, Leonard and the... More

14. The Meemaw Materialization

Sheldon's Meemaw visits and there's friction between her and Amy, which intensif... More

15. The Valentino Submergence

Sheldon and Amy celebrate Valentine's Day, Leonard and Penny feel the pangs of a... More

16. The Positive Negative Reaction

The gang learns Bernadette is pregnant and celebrates with karaoke. Meanwhile, W... More

17. The Celebration Experimentation

Sheldon and the gang celebrate his birthday and he's surprised by a special guest.

18. The Application Deterioration

Howard reconsiders entering into a legal partnership with Leonard and Sheldon, a... More

19. The Solder Excursion Diversion

Sheldon shocks Amy with a startling revelation after she buys him a laptop. Raj ... More

20. The Big Bear Precipitation

Sheldon shares a secret about Leonard when the two go on a weekend trip with Pen... More

21. The Viewing Party Combustion

During a group get-together, a minor argument between Sheldon and Leonard turns ... More

22. The Fermentation Bifurcation

Sheldon stays with Bernadette while the rest of the gang attends an event where ... More

23. The Line Substitution Solution

Sheldon hires Stuart to spend the day with Amy. Meanwhile Leonard's mother visit... More

24. The Convergence Convergence

In the Season 9 finale, Leonard's recently divorced parents roll into town, as d... More