Mark Harmon's Gibbs is such an iconic NCIS character, and his list of rules cemented him as one of the best. Although Harmon's Gibbs left NCIS in season 19, he remains a vital character to the show.

For years, fans of NCIS knew exactly who Leroy Jethro Gibbs was: a man of few words, a hardened leader with a strict moral code, and the creator of a legendary set of rules. But now, with NCIS: ...

Fans know Gibbs has a rule for everything. And so it’s only fitting that in this NCIS and NCIS: Origins crossover, we’ll see young Leroy Jethro Gibbs (Austin Stowell) learning one. “You often hear ...

(We did expect rule #9 — don’t go anywhere without a knife — to come up when Mariel Molino ‘s Lala returned Gibbs’ knife to him.) That comes when despite the team pushing on the sheriff, he refuses to ...

[Warning: The below contains MAJOR spoilers for NCIS: Origins Season 2 Episode 5 “Funny How Time Slips Away” and NCIS Season 23 Episode 5 “Now and Then.”] ...