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Updated: Mon, 14 Oct 2013 18:30:00 GMT | By Colleen Last
The Big Bang Theory: before they were famous

Johnny Galecki



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At the age of 17 he won a major role on the hit US sitcom Roseanne. Recognise his co-star? It's Sara Gilbert, who went on to play Leonard's on/off love interest, Leslie Winkle.

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