CBS Interactive

A CBS sitcom that revolves around Caltech professors Leonard and Sheldon, their neighbor, Penny, and their friends, Raj and Howard. The show’s main cast has since expanded to include Bernadette and Amy, while its main arc has revolved around the will-they-won’t-they romance between Penny and Leonard. Now in its ninth season, The Big Bang Theory is currently the most popular sitcom on American television, regularly pulling in close to 20 million viewers for every new installment. In fact, the show’s popularity resulted in its three leading stars — Kaley Cuoco, Johnny Galecki, and Jim Parsons — each negotiating new contracts at the beginning of its eighth season that sees them paid $1 million every episode.