1. The Date Night Variable

On the sixth season premiere, Howard discovers that he can't escape his mother -... More

2. The Decoupling Fluctuation

When Sheldon learns that Penny is thinking about breaking up with Leonard, he tr... More

3. The Higgs Boson Observation

Amy's nervous when Sheldon hires Alex, a female assistant.

4. The Re-Entry Minimization

Howard returns from space -- without the welcome he wanted.

5. The Holographic Excitation

The gang celebrates Halloween at Stuart's comic book store.

6. The Extract Obliteration

Sheldon's friendship with renowned scientist Stephen Hawking is threatened by a ... More

7. The Habitation Configuration

Bernadette pressures Howard to move out of his mother's house.

8. The 43 Peculiarity

Howard and Raj try to solve a mystery about Sheldon.

9. The Parking Spot Escalation

Sheldon and Howard battle over an assigned parking spot.

10. The Fish Guts Displacement

Howard bonds with his father-n-law on a fishing trip.

11. The Santa Simulation

Sheldon unwillingly revisits some Christmas memories during a lively game of Dun... More

12. The Egg Salad Equivalency

Sheldon is accused of sexual harassment at the University and winds up dragging ... More

13. The Bakersfield Expedition

Leonard's car is stolen when the guys take a road trip to a comic book conventio... More

14. The Cooper/Kripke Inversion

Outraged that he's being forced to work with his university nemesis, Barry Kripk... More

15. The Spoiler Alert Segmentation

When Sheldon and Leonard fight, it affects Penny and Amy's living arrangements. ... More

16. The Tangible Affection Proof

Sheldon struggles to find a Valentine's gift for Amy.

17. The Monster Isolation

Raj vows never to leave his apartment after a horrible date.

18. The Contractual Obligation Implementation

Leonard, Sheldon and Howard try to advance the cause of women in science by spea... More

19. The Closet Reconfiguration

When Howard finds a letter from his father, he's forced to confront his past. An... More

20. The Tenure Turbulence

Leonard, Sheldon and Raj fight for tenure at the University.

21. The Closure Alternative

After one of his favorite TV shows gets canceled too soon, Sheldon feels lost, s... More

22. The Proton Resurgence

Leonard and Sheldon hire Professor Proton (Bob Newhart), the host of their favor... More

23. The Love Spell Potential

When the girls' trip to Vegas falls through, the guys invite them to a Dungeons ... More

24. The Bon Voyage Reaction

On the sixth season finale, Sheldon and Penny are thrown for a loop when Leonard... More