MarkHarmon holds Jethro Gibbs close to his heart. After 18 years of playing the special agent on “NCIS,” Harmon exited the show as a series regular in 2021 but remained a series regular.
NCIS fans know the duo well from the parent show, where their older version solved many cases. MarkHarmon played Gibbs on NCIS; Austin Stowell now plays the younger Gibbs on NCIS: Origins.