In the 22nd episode of season 3, "The Staircase Implementation," the show gives fans some backstory when Sheldon and his best friend Leonard (Johnny Galecki) have such a loud fight in their ...

Mayim Bialik once identified the Big Bang Theory episode that people talk to her about more than any other and revealed a bit ...

Bazingas abound when Leonard comes to fetch a sleepless Sheldon, who has broken into a children's ball pit. (Here's every single "Bazinga!" from seasons 1-4.) 4. The Roommate Agreement More than ...