On The Big Bang Theory Season 9 Episode 19, Koothrappali sells out Leonard and Wolowitz when they lie to their wives so they can attend a screening of a movie.

When a show is as sprawling and long-running as The Big Bang Theory, which ran for 12 seasons, some storylines are bound to fall by the wayside.

TVLine is taking stock of the many nods, cameos and crossovers linking "Young Sheldon" to its predecessor, "The Big Bang Theory." First launched in September 2017, the long-running prequel filled in ...

If you are picking a rewatchable episode, you are usually picking the purest version of what people watch the show for.