Star Wars icon Mark Hamill makes a surprise appearance on Big Bang Theory, thanks to a years-long friendship with co-star Simon Helberg.
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Helberg and Hamill had been friends for over a decade before the Big Bang Theory cameo, having met through their mutual love of magic and comedy.
Hamill's appearance as a guest star was not in the original script, but was written in specifically for him after Helberg lobbied the producers to include his famous friend.
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Simon Helberg, Mark Hamill, The Big Bang Theory, The Big Bang Theory