The Big Bang Theory Cast: Before They Were Stars

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These actors have CBS to thank for their popularity and their paychecks, not to mention quite a few Emmys among them. Check out The Big Bang Theory cast before they were stars!

1. Kaley Cuoco

Kaley Cuoco
After she was Bridget Hennessy on 8 Simple Rules, Kaley Cuoco did a stint as a witch-in-training on Charmed. Then she bought some boobs and moved in next to Leonard and Sheldon to set up residence as Penny on TBBT.

2. Jim Parsons

Jim Parsons
Prior to becoming Sheldon Cooper, Jim Parsons appeared in Zach Braff's Garden State and on Judging Amy.

3. Johnny Galecki

Johnny Galecki
Once upon a time, Johnny Galecki played Roseanne Conner's son-in-law on Roseanne after knocking up and marrying Darlene. Now he has Golden Globe and Emmy noms under his belt as Leonard on TBBT.

4. Kunal Nayyar

Kunal Nayyar
Kunal Nayyar had just two credits to his name prior to appearing on TBBT. One, a role on S.C.I.E.N.C.E, and another a guest spot on NCIS.

5. Simon Helberg

Simon Helberg
Simon Helberg's pre-TBBT credits include National Lampoon's Van Wilder and A Cinderella Story. Now he's a Critic's Choice Award winner for Best Supporting Actor.

6. Mayim Bialik

Mayim Bialik
After playing Blossom for five seasons, Mayim Bialik went to Yale and earned a Ph.D in Neuroscience. Now she plays Amy Farrah Fowler, a character not terribly unlike herself.

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Johnny Galecki was also Rusty Griswold in Christmas Vacation!

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