In The Big Bang Theory, fans got to know the couple of Penny and Leonard (Johnny Galecki), who ended up happily married after a long relationship that, like any real-life one, had its ups and downs.

The Big Bang Theory had plenty examples of this. One example of the latter is Dr. Stephanie Barnett, who pops up in Season 2 for three episodes as a love interest of Leonard. During these three ...

Johnny Galecki made Leonard Hofstadter one of The Big Bang Theory's most lovable characters, but he wasn't the only one up for the role — and luckily, one of actors who lost out ended up winning a ...

Best known for popularizing the character of Spock, Nimoy has made countless cameos reprising the character, including on CBS' hit comedy "The Big Bang Theory." Perhaps his best appearance on the ...

In this episode, the origins of all the relationships are revealed, making it unnecessary to start with The Big Bang Theory‘s pilot (though Sheldon and Leonard’s friendship wasn’t thoroughly ...