NCIS Secrets Fans Could Have Never Discovered

Since its debut in 2013, "NCIS" has delighted audiences and built an astonishingly devoted fan base. But even the most loyal viewer may not be as familiar as they believe with the inner workings of the series.

From the actor who almost didn't get cast, to the tension between certain co-stars, here is a look at some of the biggest "NCIS" facts you probably didn't know.

CHAPTER 1

1. "NCIS" Originally Had a Different Title

When "NCIS" first aired as a spinoff to "JAG" in 2003, CBS officials worried that viewers would confuse it with "CSI." To differentiate the two, the network named the first season of the new show, "Navy NCIS." The series later abandoned the word "Navy" from the title for its repetition — the "N" in "NCIS" already stands for "Naval."

Go to the 'Next chapter' to find out more intriguing facts about the TV series NCIS.

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