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.

In season 1 of The Big Bang Theory, Leonard was introduced as a hapless genius who was a doormat overall. He let his roommate, Sheldon Cooper, completely control his life, and he was at the ...

In the 17th episode of the debut season of "The Big Bang Theory," something huge happens: Leonard Hofstadter (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 ...

Leonard Hofstadter finds himself for most of The Big Bang Theory having to give in to Sheldon's demands. From the time he gets to use the bathroom to what temperature the thermostat is set ...

Sheldon Cooper (Jim Parsons), Leonard Hofstadter (Johnny Galecki), Howard Wolowitz (Simon Helberg), and Raj Koothrappali (Kunal Nayyar) form the core friend group with Kaley Cuoco's Penny ...

If you look closely, though, the writers revealed Leonard Hofstadter’s IQ in a subtly way early on, and let’s say he’s almost as smart as Sheldon. While fans largely think of Sheldon as the ...

Life turns upside down for Leonard Hofstadter when a girl named Penny moves across the hall from him and Sheldon. Soon, Leonard falls madly in love with this beautiful wannabe actor. Though he ...

The Big Bang Theory starts with the friendship of Leonard Hofstadter and Sheldon Cooper, two physicists living together in Pasadena, California. Their lives take a turn when Penny enters the ...

CBS Photo Archive / CBS via Getty Images As far as most people are aware, the first episode of the series introduces main characters Sheldon Cooper (Jim Parsons), Leonard Hofstadter (Johnny ...