The Big Bang Theory
24 episodes
1. The Date Night Variable
1. The Date Night Variable
On the sixth season premiere, Howard discovers that he can't escape his mother -- even in space! Back on earth, meanwhile, Raj turns his existence as a third wheel into an art form
2. The Decoupling Fluctuation
2. The Decoupling Fluctuation
When Sheldon learns that Penny is thinking about breaking up with Leonard, he tries to intervene. Meanwhile, Howard is being picked on in space by the other astronauts.
3. The Higgs Boson Observation
3. The Higgs Boson Observation
Amy's nervous when Sheldon hires Alex, a female assistant.
4. The Re-Entry Minimization
4. The Re-Entry Minimization
Howard returns from space...without the welcome he wanted.
5. The Holographic Excitation
5. The Holographic Excitation
The gang celebrates Halloween at Stuart's comic book store. Meanwhile Leonard and Penny discover a new spark in their relationship when he seduces her with science.
6. The Extract Obliteration
6. The Extract Obliteration
Sheldon's friendship with renowned scientist STEPHEN HAWKING is threatened by a game of "Words with Friends," while Penny secretly enrolls in a class at the local college.
7. The Habitation Configuration
7. The Habitation Configuration
Bernadette pressures Howard to move out of his mother's house, while Sheldon finds himself caught in the middle of a fight between Amy and Wil Wheaton.
8. The 43 Peculiarity
8. The 43 Peculiarity
Howard and Raj try to solve a mystery about Sheldon.
9. The Parking Spot Escalation
9. The Parking Spot Escalation
Sheldon & Howard battle over an assigned parking spot.
10. The Fish Guts Displacement
10. The Fish Guts Displacement
Howard bonds with his father-n-law on a fishing trip.
11. The Santa Simulation
11. The Santa Simulation
Sheldon unwillingly revisits some Christmas memories during a lively game of Dungeons and Dragons, while Raj joins the girls for ladies night out.
12. The Egg Salad Equivalency
12. The Egg Salad Equivalency
Sheldon is accused of sexual harassment at the University and winds up dragging Leonard, Raj and Howard into the fray.
13. The Bakersfield Expedition
13. The Bakersfield Expedition
Leonard's car is stolen when the guys take a road trip to a comic book convention in Bakersfield, dressed as Star Trek characters.
14. The Cooper/Kripke Inversion
14. The Cooper/Kripke Inversion
Outraged that he's being forced to work with his university nemesis, Barry Kripke (guest star JOHN ROSS BOWIE), Sheldon faces a crisis of conscience.
15. The Spoiler Alert Segmentation
15. The Spoiler Alert Segmentation
When Sheldon and Leonard fight, it affects Penny and Amy's living arrangements. Meanwhile, Raj takes care of Mrs. Wolowitz while Howard is away.
16. The Tangible Affection Proof
16. The Tangible Affection Proof
Sheldon struggles to find a Valentine's gift for Amy.
17. The Monster Isolation
17. The Monster Isolation
Raj vows never to leave his apartment after a horrible date.
18. The Contractual Obligation Implementation
18. The Contractual Obligation Implementation
Leonard, Sheldon and Howard try to advance the cause of women in science by speaking with junior high girls about their future careers, while Raj plans his date with Lucy.
19. The Closet Reconfiguration
19. The Closet Reconfiguration
To open or not to open? When Howard finds a letter from his father, he's forced to confront his past. And Leonard and Penny throw a "grown-up" cocktail party at the apartment.
20. The Tenure Turbulence
20. The Tenure Turbulence
Leonard, Sheldon and Raj fight for tenure at the University.
21. The Closure Alternative
21. The Closure Alternative
After one of his favorite TV shows gets canceled too soon, Sheldon feels lost, so Amy tries to help him get over his compulsive need for closure by retraining his brain.
22. The Proton Resurgence
22. The Proton Resurgence
Leonard and Sheldon hire Professor Proton (guest star BOB NEWHART), the host of their favorite childhood TV show to perform. Raj leaves his dog with Howard and Bernadette.
23. The Love Spell Potential
23. The Love Spell Potential
When the girls' trip to Vegas falls through, the guys invite them to a Dungeons & Dragons date night that causes Sheldon and Amy's relationship to take an unexpected turn.
24. The Bon Voyage Reaction
24. The Bon Voyage Reaction
On the sixth season finale, Sheldon and Penny are thrown for a loop when Leonard is offered an exciting new job opportunity overseas.
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