Harrison Ford was considered for the role of Leroy Gibbs in NCIS before Mark Harmon was cast, according to NCIS executive producer Charles Floyd Johnson. However, Johnson mentioned that Ford's name was only thrown out and they ultimately went with Harmon. It is unclear how Ford's portrayal of Gibbs would have differed from Harmon's, but Harmon's portrayal has become iconic. Harmon exited the show in season 19, but there is a possibility of his return. While it would have been interesting to see Ford in the role, Harmon is deemed the right choice.