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!

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.
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Johnny Galecki was also Rusty Griswold in Christmas Vacation!

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