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Hollywood's Secret Sitcom Stars

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Joseph Gordon-Levitt: '3rd Rock from the Sun'

Joseph Gordon-Levitt is best known for big screen movie roles in films such as "The Dark Knight Rises" and "Inception," but the actor first gained fame on the sitcom "3rd Rock from the Sun." Gordon-Levitt played Tommy Solomon, an old alien living on Earth while stuck in a teenager's body, for 131 episodes. —XFINITY Entertainment Staff (Photos: Getty Images)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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