After 19 seasons, Mark Harmon has officially left NCIS, but he remains a producer on the show. In his final episode, Gibbs decided to retire and stay in Alaska. Harmon reflected on his departure from the show, stating that he found the character challenging and honest. He also hinted at the possibility of returning in the future. The show has made it clear that Gibbs is irreplaceable, both for the characters on the team and the show's creators.

There is a chance for Harmon to make guest appearances in the future.