Raj chills with Leonard and Penny on the sixth season premiere of The Big Bang Theory, titled "The Date Night Variable."
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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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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 is a nice guy. But he can also be a very demanding friend toward Leonard, as evidenced here.
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They're back together! All seems right in the world when Penny is dating Leonard, don't you agree?
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It's a romantic evening for two on the 100th episode of The Big Bang Theory. We're very jealous of Leonard.
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The men of The Big Bang Theory do their thing in this shot from the sitcom. It's courtesy of the episode "The Shiny Trinket Maneuver."
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TBBT Quotes

Penny, there's only one cookie with something in the middle that solves life's problems, and that's an Oreo. Or a Nutter Butter, if you're in a pinch.

Sheldon

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.