NCIS has been revealing the rules that Gibbs (played by Mark Harmon) lives by over the last 19 seasons. Now, as questions are being raised over how long Harmon is going to stay on the CBS show, Rule ...

There's a new, younger Leroy Jethro Gibbs coming to "NCIS: Origins." Austin Stowell has been cast in the upcoming "NCIS" prequel series that explores the early years of Gibbs' career, CBS said Monday.