As the spinoff of The Big Bang Theory, Young Sheldon has a lot of easter egg references to the original series. We recap ten ...

Although Penny appeared on all 12 seasons, she never had a last name until she married Leonard during ... A few years before “The Big Bang Theory” ended, “Young Sheldon” was created ...

He went on to say that her relationship with the two series leads, Leonard Hofstadter (Johnny Galecki) and Sheldon Cooper ... throughout The Big Bang Theory. While she first appeared superficial ...