NCIS: Origins has added two new characters to its lineup. The upcoming show is a spinoff that serves as a prequel following the early years of Leroy Jethro Gibbs, the character played by Mark Harmon on the flagship show for 18 years. Harmon, who departed the show in season 19, will be returning as the narrator for the spinoff, which is set to premiere during the 2024-2025 television season.
