T hroughout the history of "NCIS," Special Agent Leroy Jethro Gibbs (Mark Harmon, Austin Stowell) has followed a strict set of rules, edicts that also inform the wisdom he imparts

Some people who have been watching NCIS since its inception feel that they already know the backstory for its lead character Special Agent Leroy Jethro Gibbs (Mark Harmon), so they feel as if there’s no need for the prequel,

Long running series 'NCIS' spawns another spin-off with 'NCIS: Origins,' which delves into Gibbs' early years.

Warning: SPOILERS for the NCIS: Origins two-part premiere “Enter Sandman” are ahead!

Origins so far. And while it is exciting to see Harmon return to his role again, and even briefly on-screen in NCIS: O