It was always a delight watching The Big Bang Theory and one of "Leonard", "Howard", "Raj" or "Sheldon's" parents appear on screen! And "Sheldon" and "Leonard's" mothers are absolutely brilliant as "Dr. Beverly Hofstadter" and "Mary Cooper".
The Big Bang Theory: The On-Screen Parents In Real Life
But they were stars long before appearing on the show. Let's take a look at what other show's they've appeared in!