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!

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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

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