From CBR · Hannah Postlethwait · · 1m 20s
Mark Harmon's Original Gibbs Replacement Returns to NCIS After 6 Years
Sean Harmon returns as FBI agent Casey Bloom in NCIS: Origins after 6 years.
In brief
Sean Harmon returns as FBI agent Casey Bloom in NCIS: Origins after 6 years. Sean Harmon reprises his role as FBI agent Casey Bloom in NCIS: Origins Season 3, Episode 2, following Mark Harmon's exit from NCIS after 19 seasons. Originally reported by CBR.
Sean Harmon Returns to NCIS
Sean Harmon reprises his role as FBI agent Casey Bloom in NCIS: Origins Season 3, Episode 2.
Mark Harmon's Exit from NCIS
Mark Harmon exited NCIS after 19 seasons in 2026, his character last appearing in Season 19.
Casey Bloom's Role
Bloom partners with FBI Agent Josephine Swanson on the Woodrow Browne murder investigation.
Bloom's Background
Bloom has been undercover with a biker gang for the last year, calling them 'beautiful people' carrying pain.
Bloom's Character Insight
Bloom says he likes to think there's a little Keanu in all of us, referencing Johnny Utah from Point Break.
Sean Harmon's Previous Role
Sean Harmon previously played young Gibbs in NCIS Season 18, Episode 2.
Why Sean Harmon Didn't Reprise Young Gibbs
Sean Harmon focused on executive producing NCIS: Origins instead of reprise younger Gibbs.
Bloom's Future in NCIS
NCIS Special Agent-in-Charge Cliff Wheeler confirms Casey Bloom will return in future episodes.
The big picture
Sean Harmon reprises his role as FBI agent Casey Bloom in NCIS: Origins Season 3, Episode 2, following Mark Harmon's exit from NCIS after 19 seasons.
