Mark Harmon is set to return to CBS’s prequel series “NCIS: Origins” for its third season, reprising Leroy Jethro Gibbs. Multiple outlets report that Harmon will appear onscreen in every episode of Season 3, making the return a full-season, story-arc role rather than a limited guest appearance. Variety and Deadline describe the involvement as a season-long arc tied to a present-day mystery connected to Gibbs’s experiences from his Camp Pendleton days in the 1990s. The series frames Harmon’s return as part of the prequel’s broader narrative that spans different time periods.
The reports also note that Harmon is already involved with “NCIS: Origins” beyond acting: he narrates the series and serves as an executive producer. This Season 3 return marks a continued extension of his franchise involvement, following prior appearances on the spinoff. Harmon previously starred as Gibbs on the original “NCIS” for 18 seasons, a role that remains a central reference point across the coverage.
