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.

Johnny Galecki was also Rusty Griswold in Christmas Vacation!

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