Sean Harmon Will Guest Star on NCIS: Origins
The executive producer will portray FBI Agent Casey Bloom in the show's second episode of the third season.
Updated on Sept. 21, 2026 in Remote Work
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Sean Harmon is set to guest star on NCIS: Origins during the show's third season, episode two, which is titled My Own Worst Enemy. The episode will air on October 13, 2026.
Why it matters
The appearance marks a significant collaboration as Sean Harmon joins his father, Mark Harmon, who narrates the series and appears in every episode. This casting choice bridges generational connections within the long-running franchise.
Sean Harmon joins the production for season three, episode two, following his previous tenure portraying a younger version of Leroy Jethro Gibbs in eight episodes of the original series.
The players
Sean Harmon
He is an executive producer for the series who previously appeared in eight episodes of the original NCIS as a younger version of the character Leroy Jethro Gibbs.
Mark Harmon
He serves as the narrator for the series and appears in every episode of the third season.
Austin Stowell
He portrays the young Leroy Jethro Gibbs in the NCIS: Origins series.
Bobby Moynihan
He plays the character Woody in the production.
The details
In the upcoming episode, Sean Harmon will portray FBI Agent Casey Bloom while serving as an executive producer for the series. The storyline features Mark Harmon returning from Alaska to the main narrative alongside cast members Austin Stowell and Bobby Moynihan.
Timeline
The episode is set in 1992.
The NCIS: Origins series premiered in 2024.
The episode will air on October 13, 2026.
Market Landscape
This casting choice reflects the broader industry trend of leveraging deep intellectual property connections to maintain franchise continuity across spin-off series. It reinforces the show's competitive positioning within the established NCIS universe by linking legacy talent to new production efforts.
Fans of the franchise can expect a specific narrative crossover during the October 13, 2026, broadcast. Viewers should plan to tune in for the episode premiere to see how the character Casey Bloom integrates into the established 1992 storyline.
The takeaway
The addition of legacy actors to established franchises demonstrates a strategic approach to maintaining audience engagement through nostalgia. Viewers can look for similar casting strategies in future franchise installments to deepen narrative connectivity.
Further reading
For more on how productions manage talent across interconnected series, visit Remote Work.
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