Keith Carradine on TBBT

Yes, that's Keith Carradine on The Big Bang Theory. He's played the character of Penny's dad.
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Return of Wil Wheaton

Wil Wheaton returns to The Big Bang Theory on the episode "The 21-Second Excitation." He once again causes problems for the fellas.
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Pretty, Funny Guest Star

Welcome to comedy, Eliza Dushku. The actress appears as a FBI agent on The Big Bang Theory episode "The Apology Insufficiency."
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Eliza Dushku on The Big Bang Theory

Eliza Dushku guest stars on the November 4 episode of The Big Bang Theory. She plays a federal agent.
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The Irish Pub Formulation Scene

Leonard tries to keep an affair secret from Sheldon on "The Irish Pub Formulation." This is a scene from that episode.
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Amy with Sheldon

Amy has a request of Sheldon on the episode "The Desperation Emanation." She wants to introduce him to her mother.
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Big Bang Guest Stars

That's Katee Sackhoff and that's George Takei. Both guest star as themselves on the episode "The Hot Troll Deviation."
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The Zazzy Substitution Scene

Who needs human companionship?!? Not Sheldon, this character hopes, on the episode titled "The Zazzy Substitution."
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A Sheldon Diagram

How can Sheldon live longer? That's what he tries to figure out on the episode "The Cruciferous Vegetable Amplification."
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Sheldon vs. Wil Wheaton

Say hello to Sheldon's nemesis on The Big Bang Theory: oh, yes, it's Evil Wil Wheaton!
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Fourth Season Poster

The Big Bang Theory airs on a new night during its fourth season. But this poster promises the same old hilarity.
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Awkward Date

Sheldon requires a chaperon on his first date when season four of The Big Bang Theory kicks off. Penny is chosen for the job.
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TBBT Quotes

Oh, Bernadette, please play my clarinet.

Raj's poem

Sheldon: I'll have a diet Coke.
Penny: Can you please order a cocktail? I need to practice mixing drinks.
Sheldon: Fine... I'll have a virgin Cuba Libre.
Penny: That's... rum and Coke without the rum.
Sheldon: Yes, and would you make it diet?