The protagonist of 19 seasons of “NCIS” returns to his character’s origin story.
TheNCIS-verse has expanded, andMark Harmonis still along for the ride.
Monty Brinton/CBS via Getty Images
Harmon appeared in 437 episodes ofNCISacross 19 seasons.

Mark Harmon in ‘NCIS’.Monty Brinton/CBS via Getty Images
[But] the first day, we worked 22 hours.
So I thought, ‘That’s not exactly what I thought this was going to be.’
But we had a lot of days like that in the first four years."

Mark Harmon as Leroy Jethro Gibbs in ‘NCIS’.Photo Archive/Getty Images
Harmon will executive produce the series as well, alongside his son Sean.
The coveted role ofyoung Gibbsrecently went toAustin Stowellwho has appeared in films likeWhiplashandBridge of Spies.
“We just knew when Austin came in that he was Gibbs, Monreal recently toldEntertainment Weekly.
NCIS: Originspremieres on Monday, Oct. 14, at 10 p.m. ET/PT, on CBS.