Adult Sheldon's appearance on Young Sheldon marked a sentimental nod to The Big Bang Theory while wrapping up the Cooper clan story. Fans speculate Leonard's fate given his absence in the finale ...

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 ...

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.

Many of the characters who appeared in The Big Bang Theory only for a cameo helped add depth to key details that were crucial in the broader context. How could Leonard and Penny become a couple ...

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 ...