Kaley Cuoco's Penny has a lot of great episodes in "The Big Bang Theory" — but which ones are her very best?

Sara Gilbert was a prominent character on The Big Bang Theory's earliest years, so her sudden disappearance remains a headscratcher for many.

Amid a Big Bang Theory rewatch, Wil Wheaton shared a sweet memory from his time filming Amy and Sheldon's wedding, and it's so sweet.

Bazinga! These guys really know their superheroes. Join us as we count down the funniest and most memorable superhero references in "The Big Bang Theory!" Our countdown includes Sheldon's iconic "I'm ...