Mark Harmon to Make a Cameo on 'NCIS: Origins'!

Mark Harmon is appearing in NCIS: Origins!

The actor, who portrays Leroy Gibbs, is set to briefly appear in the premiere episode of the NCIS prequel series, Deadline confirmed.

While talking to reporters on Thursday (September 19), co-showrunner David J. North revealed that new footage was shot for the prequel, which debuts in October on CBS.

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“That was a discussion between Mark, myself and Gina Monreal,” he said of including Mark in the footage. “I hope the audience will be excited to see him after so many years.”

He will also be a narrator for each episode.

“We are focusing on him telling the story of 1991,” the co-showrunner added. “As far as Mark appearing again, we are open to anything.”

NCIS: Origins begins in years prior to the events of NCIS. In the new series, a young Gibbs (Austin Stowell) starts his career as a newly minted special agent at the fledgling NCIS Camp Pendleton office where he forges his place on a gritty, ragtag team led by NCIS legend Mike Franks. Find out who else is set to appear in the series!