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 ...

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 ...