NCIS: Origins Co-Creator on 1 Detail Mark Harmon Doesn’t Know About Gibbs

NCIS: Origins co-creator David J. North has revealed that Mark Harmon does not recall a key detail long associated with the character. Despite portraying Leroy Jethro Gibbs for nearly two decades, the actor doesn’t remember his character’s well-known rules. The revelation, shared during a recent discussion about the franchise, comes as a surprise to viewers.

NCIS: Origins co-creator David J. North has offered a light, behind-the-scenes story about Mark Harmon in an interview with Entertainment Weekly. While recording Harmon’s brief voiceover for the NCIS/NCIS: Origins crossover, North discovered that the actor who portrayed Leroy Jethro Gibbs for nearly two decades does not actually remember the franchise’s famous rulebook.North explained that the episode’s storyline is based on Rule No. 11, prompting him to bring it up during the session. The creator recalled, “We were in the sound studio doing Mark’s voiceover with him the other day.”