![Big Bang Theory' actor Johnny Galecki says guest star Mark Hamill is obsessed with 'Roseanne' trivia | Fox News Big Bang Theory' actor Johnny Galecki says guest star Mark Hamill is obsessed with 'Roseanne' trivia | Fox News](https://static.foxnews.com/foxnews.com/content/uploads/2018/09/galeckihamill1.jpg)
Big Bang Theory' actor Johnny Galecki says guest star Mark Hamill is obsessed with 'Roseanne' trivia | Fox News
![Mark Hamill on Twitter: "Congratulations @bigbangtheory for 12 history-making years of laughter, elevating nerd-culture to unimagined new heights & triggering countless folks to ask me if I would please officiate at their Mark Hamill on Twitter: "Congratulations @bigbangtheory for 12 history-making years of laughter, elevating nerd-culture to unimagined new heights & triggering countless folks to ask me if I would please officiate at their](https://pbs.twimg.com/media/D6tW1jhUEAAw1KB.jpg)
Mark Hamill on Twitter: "Congratulations @bigbangtheory for 12 history-making years of laughter, elevating nerd-culture to unimagined new heights & triggering countless folks to ask me if I would please officiate at their
May The 4th Be With You | The force is strong on The Big Bang Theory's set as Wil Wheaton & Mark Hamill are on hand for next week's big ShAmy wedding!
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