The Big Bang Theory was almost canceled but was saved after Kaley Cuoco was cast as Penny, as her character brought a positive impact to the show.

The unaired pilot of the show had problems with its storytelling, prompting the decision to recast Amanda Walsh’s character, Katie. Chuck Lorre was determined to enhance the script, and the addition of Kaley Cuoco to the cast proved to be instrumental in making the show successful.

Penny played a pivotal role in the show’s triumph. She served as the audience’s viewpoint, unafraid to point out Sheldon’s improper conduct, and acted as a catalyst for his personal development. Without her presence, Sheldon’s eccentric behavior would have been too overpowering.

The Big Bang Theory was given the green light only after Kaley Cuoco was cast as Penny, according to a former CBS executive. Although Bill Prady and Chuck Lorre’s popular sitcom has become one of the most successful shows ever, it almost didn’t happen.

The original pilot for The Big Bang Theory was shown to the network, but it had some storytelling issues that needed to be addressed. Among the changes that Prady and Lorre made, replacing the main female character was the most significant one.