The Big Bang Theory: 10 Theories On How It Will End
6. All The People Previously Mentioned, But Never Seen Appear
There's a common trope in television where a certain person never makes an appearance on screen. For Cheers, it was Vera, on Friends, it was the Ugly Naked Guy (well, at least not his full face), and on The Big Bang Theory, it's several people.
Howard's mother is an obvious inclusion on this list, as are his and Bernadette's children. You may think you've seen those kids, but all the audience has seen is a bassinet or two with the children obscured.
There are other characters who have been mentioned but never seen. While they have only been a topic of conversation — usually when Leonard's mother is tearing him down, his siblings have never been seen. In fact, Leonard's sister has been mentioned but never given a name.
The only revelations about Leonard's siblings that have come from his mother are that his brother, Michael, is a tenured law professor at Harvard University and his unnamed sister works with gibbons to cure diabetes.
When the final episode airs, it would be satisfying to finally meet these people on screen. Having some sort of photo of Howard's mom on display around actual child actors playing his kids would also be a nice way of paying homage to the late Carol Ann Susi and bringing an end to their story.