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

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

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

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,

Sean played a Young Gibbs on NCIS during flashback scenes, and many fans thought he was great in the role. He seemed like the obvious choice to play Gibbs again on the new show, but Sean has helped create the show and serves as an executive producer.

In the role of former NCIS lead Leroy Jethro Gibbs, Mark Harmon is a tough act to follow. But it seems he found a worthy successor in NCIS: Origins star Austin Stowell.

NCIS: Origins has premiered on CBS, and Mark Harmon’s role in the first episode has been revealed. It was previously reported that Harmon, who serves as executive producer and narrator on the NCIS prequel,

Co-showrunner Gina Lucita Monreal confirms its plans for tackling Leroy Jethro Gibbs' revenge against Pedro Hernandez in NCIS: Origins.