Who Plays Zack On The Big Bang Theory & What Happened To Him?

Who Plays Zack On The Big Bang Theory & What Happened To Him?

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Learn More Who Plays Zack On The Big Bang Theory & What Happened To Him? Before Penny (Kaley Cuoco) ends up with Leonard (Johnny Galecki) on "The Big Bang Theory," much is made of her unsavory dating history. "You're the first guy [my dad's] ever really approved of, you know?" she tells Leonard in…

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