These Celebs Guest-Starred On Television Shows Before Their Big Break

Mark Hamill in "The Big Bang Theory"

But where there's Carrie Fisher, Mark Hamill isn't far behind. This "Star Wars" star also had a brief cameo on "The Big Bang Theory." In season 11, he officiated Amy and Sheldon's wedding. 

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The More You Know

  • Michael J. Fox's middle name doesn't start with a "J." His middle name is actually Andrew.
  • Jack Black is the son of rocket scientists.
  • Leonardo DiCaprio's mom was looking at a Leonardo da Vinci painting in a museum in Italy when Leo first kicked. That's why he's named Leonardo.
  • One of David Bowie's eyes was permanently dilated.
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