According to TVGuide.com, which show was the most-watched during the 2012-13 TV season?

The most-watched show during the 2012-13 TV season was indeed "NCIS." This program has consistently topped charts in viewership ratings due to its compelling storytelling and strong character development, which resonate with a broad audience. Additionally, "NCIS" benefits from a solid formula of blending crime drama with humor, keeping viewers engaged episode after episode.

While shows like "Breaking Bad," "The Big Bang Theory," and "Grey's Anatomy" enjoyed popularity and critical acclaim, none matched the massive audience numbers that "NCIS" achieved during that particular season. "The Big Bang Theory," for example, garnered considerable attention, particularly among younger demographics with its comedic take on nerd culture, but did not reach the viewership level of "NCIS." Similarly, "Breaking Bad" built a devoted following but largely appealed to a niche audience, while "Grey's Anatomy" continued to attract viewers due to its emotional storytelling but also fell short of "NCIS" in overall ratings that season.