The Big Bang Theory Season Premiere Pics, Poster: New Night. Same Theory.

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Look out, Bones!

Take cover, Community!

Sheldon, Leonard and company are invading the 8 p.m. time slot on Thursdays this fall, as The Big Bang Theory makes a major move. But, don't worry fans, this poster should quell any fears you may have about other changes to the show. Just read its tagline:

Fourth Season Poster

The sitcom returns with new episodes on September 23. As previously reported, Mayim Bialik will reprise her role as Sheldon's love interest on the premiere - but Penny will also find herself involved in this pair's dating life.

See what we mean in one of the two pics below from "The Robotic Manipulation."

Awkward Date
Feelin Good

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.

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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.