Season 6
'Spock'-tacular: The cast can't get enough 'Star Trek' on 'BBT'
The cast of "BBT" can't "Live Long and Prosper" without "Star Trek" in their lives...
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The Bon Voyage Reaction, Episode 24 (Finale)
When Leonard receives an exciting opportunity to work overseas, Penny and Sheldon are thrown for a loop.
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Love is in the air!
There's more than enough love to go around with the "Big Bang" cast.
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The Love Spell Potential, Episode 23
Amy and Sheldon's relationship takes a surprising turn during a game of "Dungeons & Dragons"; Lucy and Koothrappali have an awkward date.
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The Proton Resurgence, Episode 22
Leonard and Sheldon hire the host (Bob Newhart) of their favorite childhood TV show to perform; Bernadette and Howard run into trouble while dog-sitting for Raj's pet.
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The Closure Alternative, Episode 21
Amy tries to help Sheldon get over his compulsive need for closure when one of his favorite TV shows is canceled; Raj discovers a secret about Lucy.
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The 'Big Bang' cast in costume
The "Big Bang" cast has had their fair share of playing dress up...
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The Tenure Turbulence, Episode 20
The girls get involved when Leonard, Sheldon and Raj compete for tenure at the University.
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The Closet Reconfiguration, Episode 19
Howard considers whether or not he should open a letter from his father; Penny and Leonard host a ``grown-up'' cocktail party.
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Red Carpet Styles: The cast of 'Big Bang Theory'
Forget the lab or the couch, the cast of "Big Bang Theory" hits the red carpet!
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The Contractual Obligation Implementation, Episode 18
Leonard, Sheldon and Wolowitz talk to junior high girls about science-related careers; Raj plans a date with Lucy.
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The Monster Isolation, Episode 17
Koothrappali is put out when his date walks out in the middle of their evening, so he vows that he will forever stay put in his apartment. Meanwhile, Sheldon is quite impressed when he witnesses Penny's acting skills firsthand.
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The Tangible Affection Proof, Episode 16
The guys search for a perfect Valentine's Day gift for their significant others; Stuart and Raj host a "lonely people" party at the comic book store.
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The Spoiler Alert Segmentation, Episode 15
Leonard and Sheldon get into a spat that sends Leonard across the hall to live with Penny. Meanwhile, Raj keeps an eye on Mrs. Wolowitz while Howard's away on a trip.
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The Cooper/Kripke Inversion, Episode 14
Sheldon is outraged, and his confidence takes a hit, when he's forced to work with his nemesis, Barry Kripke.
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The Egg Salad Equivalency, Episode 12
Sheldon earns a date with the Employee Relations Department when he gets accused of sexual harassment, and it looks like Leonard, Raj and Howard may go down with him.
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The Fish Guts Displacement, Episode 10
Amy takes ill and Sheldon becomes her nursemaid, while Wolowitz takes a fishing trip in order to bond with his father-in-law.
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The Parking Spot Escalation, Episode 9
Sheldon and Wolowitz's fight over a parking spot at the university impacts the whole gang.
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The 43 Peculiarity, Episode 8
Raj and Howard try to figure out why Sheldon disappears at 2:45 every afternoon; jealousy arises in Penny and Leonard's relationship.
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The Habitation Configuration, Episode 7
Bernadette wants Wolowitz to move out of his mom's house; Sheldon is caught in the middle of Amy and Wil Wheaton's argument.
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The Extract Obliteration, Episode 6
A game threatens Sheldon's relationship with Stephen Hawking; Penny secretly signs up for a college class.
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The Holographic Excitation, Episode 5
The gang heads to Stuart's comic book store to celebrate Halloween; Leonard uses science to seduce Penny.
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The Decoupling Fluctuation (Episode 2)
When Sheldon learns that Penny is thinking about breaking up with Leonard, he tries to intervene. Meanwhile, in space, the other astronauts pick on Howard.
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The Date Night Variable (Episode 1)
With his friends on dates, Raj must face his loneliness. Also, Wolowitz is caught in an argument between Bernadette and his mom, even while he's in space.
