11 Actors Were Considered to Play Leroy Jethro Gibbs on NCIS Before Mark Harmon

Before Mark Harmon became the iconic Leroy Jethro Gibbs on NCIS, the role was nearly filled by a host of other talented actors. The casting team explored various options, considering actors with strong screen presence and commanding authority—qualities essential for the character. Among those rumored to be in the running were actors like Dennis Haysbert, William Fichtner, and Jimmy Smits, each bringing their own unique style and gravitas to the role. The search for the perfect Gibbs was thorough, with producers aiming to find someone who could balance toughness with a deeply principled moral core.

Ultimately, Mark Harmon’s portrayal of Gibbs set the standard for the character, combining steely resolve with a quietly intense demeanor. Harmon’s nuanced performance resonated with audiences, making Gibbs one of television’s most respected and beloved characters. The choice proved to be a defining moment for NCIS, shaping the show’s identity and securing its place as a staple in procedural drama for years to come.