Origins takes place in 1991, the prequel that’s currently airing on the 2024 TV schedule chiefly serves as a platform for Austin Stowell to play the younger Leroy Jethro Gibbs. However, Mark Harmon, who played Gibbs on NCIS for nearly two decades,

The star tells The Hollywood Reporter how 'NCIS' helped lead him to co-author his second book, 'Ghosts of Panama,' while also balancing TV work and the upcoming 'Freaky Friday' sequel.

When Mark Harmon wrapped up his role as Leroy Jethro Gibbs on NCIS, he didn’t have a clue that he was going to return to narrate the voiceover on a prequel series, NCIS: Origins, that tells Gibbs’ story and that of Mike Franks.

Origins episode “Incognito” featured an unexpected appearance from a younger Tobias Fornell, whom Joe Spano has been playing on NCIS since it began in 2003, and whom Lucas Dixon is playing in this CBS prequel.