Sheldon tries to intervene when he discovers a secret about Penny and Leonard on The Big Bang Theory. "The Decoupling Fluctuation" is the second episode of the show's sixth season.
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You're looking at a photo from "The Date Night Variable." It's the first episode of The Big Bang Theory Season 6.
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Sheldon and company get their eat on in this scene from The Big Bang Theory Season 6 premiere.
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The Big Bang Theory boys are back! This is a photo from the Season 6 premiere.
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Leonard and Sheldon are all dressed up for Howard and Bernadette's wedding on The Big Bang Theory. "The Countdown Reflection" is the 24th episode and season finale of the show's 5th season.
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Sheldon can now die happy. On this episode of The Big Bang Theory, he meets Stephen Hawking!
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Sheldon is seen here playing video games. Instead of going to Amy's aunt's birthday party, that is.
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Whoa, what's going on here?!? The gang looks down at Sheldon's odd hairstyle in this scene from The Big Bang Theory.
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TBBT Quotes

Mrs. Cooper: Shelly! I'm so glad you're here!
Sheldon: I saw you having naked sex.

Penny: I give up, he's impossible
Sheldon: I can't be impossible, I exist. I believe what you meant to say is, "I give up, he's improbable."