The Big Bang Theory: All 12 Seasons, Ranked From Worst To Best

When a series runs for 12 seasons like The Big Bang Theory, it gains millions of viewers who love the show. There might be ups and downs with some of the character arcs or particular episodes, but it is nearly impossible for a show to run that long and not have consistent quality. Even the worst parts of the show can still be considered great by many critics and audience members.