Leonard Hofstadter was never the flashiest guy in the room but he still managed to rattle Penny more than once in The Big Bang Theory.

Over the course of its 12-season run, The Big Bang Theory cemented itself as one of the most successful sitcoms of the 21st century. The show’s focus on the exploits of Leonard (Johnny Galecki), ...

The Big Bang Theory is not just one of the longest-running TV comedies in US television history—it’s a pop-culture phenomenon ...