Mark Harmon's son, Sean, portrayed a younger version of his father's "NCIS" character several times, so why didn't he reprise the role for "NCIS: Origins"?
Mark Harmon exited "NCIS" after 19 seasons in 2021, but he arguably remains the face of CBS' long-running, naval-themed procedural saga. After all, he joined the franchise in the days of "JAG," and ...