Even Mayim Bialik didn't know this secret.

Johnny Galecki, Kunal Nayyar, Summer Glau, Simon Helberg and Jim Parsons in The Big Bang Theory. "Mark Hamill was pretty ...

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Sheldon (Jim Parsons) and Penny (Kaley Cuoco) standing in the doorway of the apartment while Penny looks confused in The Big Bang Theory Image via CBS In the beginning was the Big Bang, followed by ...

The Big Bang Theory star, Jim Parsons, revealed to ET that Sheldon is on the defensive over Amy on Monday night's episode. The Big Bang Theory star, Jim Parsons, revealed to ET that his character, ...

Raj Howard Leonard Penny and Sheldon looking at a computer on The Big Bang Theory - CBS Created by Chuck Lorre and Bill Prady, "The Big Bang Theory" was a massive success for CBS during its ...

Between both the original series and Young Sheldon, one Sheldon line still stands out as The Big Bang Theory antihero's ...

Sheldon Cooper (Jim Parsons) is the heart and soul of "The Big Bang Theory" — for worse or for better, depending on how you feel about the sometimes controversial, sometimes abrasive character.

Ahead of The Big Bang Theory franchise's first ever sequel, one major tragedy after the flagship's finale is now officially ...