Can Leonard and Penny hang out alone? That's their goal in this Big Bang Theory scene.
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Laurie Metcalf is seen here as Sheldon's mom. She is rather popular within the group.
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Wil Wheaton is back! And he's hosting a party at his house here.
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The boys are concerned about Raj here, but all we be okay. He meets a girl he can actually talk to on "The Wiggly Finger Catalyst."
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You're looking at a photo from "The Pulled Groin Extrapolation." Sheldon and Leonard have a lot to discuss.
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Leonard confronts Penny in this scene from the season five premiere of The Big Bang Theory. She sure finds something funny!
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The gang is all here. And we mean everyone! Check out this scene from the fifth season premiere of The Big Bang Theory.
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This is awkward for everyone. Raj and Penny stand in front of the boys on the fifth season premiere.
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Don't look for Leonard and Priya to slow down on season five. Not even 7,500 miles can end their relationship!
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The men have a mission on the episode "The Zarnecki Incursion." They must find the person who hacked into Sheldon's online game account.
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Can Leonard be friends with Penny while dating Priya? It might be a challenge.
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You're looking at a photo from "The Cohabitation Formulation." Raj's sister returns during the episode.
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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.

Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.