Game night turns into a messy battle of the sexes on The Big Bang Theory. "Re-Entry Minimization" is the fourth episode of the show's sixth season.
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There are unexpected consequences when Sheldon hires a new assistant on The Big Bank Theory. "The Higgs Boson Observation" is the third episode of the show's sixth season.
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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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Sheldon works here with Amy in the lab. This is his version of a vacation.
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Sheldon is a nice guy. But he can also be a very demanding friend toward Leonard, as evidenced here.
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TBBT Quotes

Penny: Here's a question-- as an alien pretending to be human, are you planning to engage in any post-prom mating rituals with Amy?
Sheldon: There are post-prom mating rituals?
Penny: Not always. Unless your date drives a van with an air mattress, then always.
Sheldon: Well, if it's part of the prom experience, then I'm open to it.
Penny: You're kidding.
Sheldon: I may be an alien, but I have urges.If Amy wants to copulate by firing her eggs into space, well, then, I will happily catch them with the reproductive sac on my upper flermin. I'm not the best at reading facial cues, but I can see that you're a little turned on.

Sheldon: Why do you have the Chinese character for "soup" tattooed on your right buttock?
Penny: It's not "soup," it's "courage."
Sheldon: No it isn't. But I suppose it does take courage to demonstrate that kind of commitment to soup.
Penny: How'd you see it? You said you wouldn't look.
Sheldon: Sorry. As I told you, the hero always peeks.