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The Big Bang Theory Cast: Before They Were Scientists (And a Waitress)

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The Big Bang Theory is a huge hit. It's already been renewed for three more seasons, which will put it through season 10.

When the series began, only two of the five lead actors had ever been on a successful show that ran for multiple seasons. Johnny Galecki played Darlene's boyfriend on the successful Roseanne for several years and Kaley Cuoco-Sweeting was best known as Bridget Hennessey on 8 Simple Rules.

In Season 3, Blossom's Mayim Balik and Melissa Rauch joined the show adding more laughs and romance to the comedy.

Before The Big Bang Theory cast played scientists and a waitress (technically, Bernadette was both), they played an wide range of characters.  Who was on Joey? MacGyver? Charmed?

Check out each of their first credited roles and other highlights!

Jim Parsons as Sheldon Cooper
Parsons first credited TV role was in 2002 on an episode of Ed, while his first movie role was as Tim on Garden State. He most recently starred on HBO's The Normal Heart and earned an Emmy nomination. He's won four Emmys for his portrayal of Sheldon Cooper.
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Need to catch up before The Big Bang Theory Season 8 begins? Watch The Big Bang Theory online now!

Carla Day is a staff writer for TV Fanatic. Follow her on Twitter and on Google+.

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TBBT Quotes

Leonard: Hi. I'm Leonard. You are beautiful. You pop, sparkle and buzz electric. I'm going to pick you up at eight, show you a night you will never forget.
Raj: Where are we going?

Leonard: What? You're afraid of both dinosaurs and chickens.
Sheldon: Yes, but tell me a dinosaur chicken salad sandwich wouldn't hit the Mesozoic spot.

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