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

Sheldon: Are you still mad about the sperm bank?
Leonard: No!
Sheldon: Do you want to hear an interesting thing about stairs?
Leonard: Not really.
Sheldon: If the height of a single step is off by as little as two millimeters most people will trip.
Leonard: I don't care—two millimeters?! That doesn't seem right.
Sheldon: No, it's true! I did a series of experiments when I was twelve; my father broke his clavicle.

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