There are seven main characters on the beloved CBS sitcom "The Big Bang Theory" — so who's the worst, and who's the best?

Amy, Bernadette, and Penny in the comic book store down in The Big Bang Theory - CBS It was always clear that the creators of "The Big Bang Theory" loved the Dark Knight. Fans were treated to several ...

Once Howard Wolowitz, the main character played by Simon Helberg on "The Big Bang Theory," manages to grow up a little bit, ...

Sheldon (Jim Parsons) and Penny (Kaley Cuoco) standing in the doorway of the apartment while Penny looks confused in The Big Bang Theory Image via CBS In the beginning was the Big Bang, followed by ...

The bond between these two characters in The Big Bang Theory goes beyond friendship and becomes an integral part of the show's appeal.