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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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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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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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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Kaley Cuoco and Mayim Bialik kick back during this Big Bang Theory scene. It's courtesy of the Season 6 premiere.
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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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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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TBBT Quotes

Raj: Well, to paraphrase Shakespeare: It's better to have loved and lost than to stay home every night and download increasingly shameful pornography.
Penny: Oh... you poor baby.
Raj: What's wrong with me, Penny?
Penny: Nothing, nothing. You know, if we weren't friends - and you hadn't brought up that creepy pornography story - I'd be on you like the speed of light squared on matter to make energy.
Raj: Hey, you totally got that right. E = MC squared.
Penny: I listen. I have no idea what it means, but I listen.

Sheldon: I recently read that during World War Two, Joseph Stalin had a research program to create supersoldiers by having women impregnated by gorillas.
Howard: What a sick use of science.
Raj: Hey, as long as the baby's healthy.
Amy: I wonder if Stalin considered any other animals.
Leonard: Hippos are the deadliest creature. A half-human, half-hippo soldier would be pretty badass.
Howard: Yes, but when they're hungry-hungry, you can stop them with marbles.
Sheldon: Yeah, the correct animal for interspecies supersolider is koala. You would wind up with an army so cute it couldn't be attacked.