Although The Big Bang Theory ’s worst mistake came relatively late in the popular sitcom’s 12-season run, the series still never recovered from this easily avoidable blunder. By The Big Bang Theory ’s finale , the show’s heroes had mostly received their happy endings. Sheldon and Amy had won the Nobel Prize, and Leonard and Penny were happily married.

Bernadette and Howard were successful professionally and parents twice over, and, although Raj’s single status caused some controversy among the fandom, he was undeniably faring fine. In the time since The Big Bang Theory ’s pilot , he had gone from suffering from selective mutism whenever women spoke to him to bringing Sarah Michelle Gellar as his date to the Nobel ceremony.

However, just because the Pasadena gang got their r

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