Lewis Black to Guest Star on The Big Bang Theory

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Lewis Black will guest star this fall on an episode of The Big Bang Theory.

The stand-up comedian and Daily Show contributor will appear in the September 28 installment of the sitcom in the role of Professor Crawley, an entomologist whose life is a shambles. He gets involved in a bet between Sheldon and Wolowitz.

As for the show's other big storyline heading into season three, executive producer Bill Prady spoke to Entertainment Weekly about the upcoming hook-up between Leonard and Penny.

"There’s been two years of foreplay and the feeling was that it’s time," Prady said about these two getting together. "We know how Penny feels and we know how Leonard feels. And when he comes back from the North Pole [in the season premiere], she’s figured everything out and thinks they should just got for it. But a Sheldon crisis keeps Leonard from being able to move forward.”

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

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TBBT Quotes

Oh, Bernadette, please play my clarinet.

Raj's poem

Sheldon: I'll have a diet Coke.
Penny: Can you please order a cocktail? I need to practice mixing drinks.
Sheldon: Fine... I'll have a virgin Cuba Libre.
Penny: That's... rum and Coke without the rum.
Sheldon: Yes, and would you make it diet?