The upcoming prequel show NCIS: Origins is set to explore NCIS protagonist Leroy Jethro Gibbs' origins more than the original series, including explaining the longest-running joke about Gibbs and his character. NCIS: Origins has already cast young Gibbs, so, inevitably, audiences will eventually see actor Austin Stowell develop some of the strong traits that defined his character in the original series. While it will be interesting to learn more about the mysterious Gibbs, it is also important that the upcoming prequel doesn't reveal too much.

https://screenrant.com/ncis-origins-prequel-show-leroy-jethro-gibbs-rules-explain/