Here's how The Big Bang Theory managed to get Mark Hamill to cameo during its penultimate season. After cementing itself as one of the biggest comedy hits of the 2000s/2010s, The Big Bang Theory finally came to an end in 2019 after a whopping 12 seasons. As many detractors as Big Bang Theory had, there's no doubt that viewers still miss getting their new weekly dose of Leonard, Sheldon, Penny, and the gang. If nothing else, at least re-runs continue to air on a constant basis on TBS.
Over its 12
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