Mark Harmon children: Who is son Sean Harmon? Star confirmed for NCIS season 18 return

MARK HARMON is much-loved as NCIS leader Leroy Gibbs in the hit crime series. But who is his son Sean Harmon?
NCIS season 18 will see Sean Harmon return to the series once again as he reprises his role as a younger Leroy Gibbs. Here’s everything fans need to know about him and how he has followed in his father Mark Harmon’s footsteps.
Who is Mark Harmon’s son Sean Harmon?

Fans of NCIS will know Harmon’s son Sean has already appeared in a number of episodes as a younger version of Gibbs.

Now it has been confirmed by TV Guide magazine the 32-year-old actor will be coming back again in season 18.

Sean is set to appear in the upcoming 400th episode of the show, which had been postponed from season 17.

The outing will follow the story of how Gibbs found his way onto the NCIS team as well as how he met Donald ‘Ducky’ Mallard (David McCallum).


Speaking to the publication back in June, executive producer Frank Cardea said: “The goal for this episode was to write a love letter to the longtime fans.”

The new episode will mark the seventh appearance of Sean on the series after he has starred on and off.

Viewers first saw him play a young Gibbs in 2008 in some flashbacks during the episode Heartland.

He also appeared in the 200th episode of NCIS which focused on Gibbs’ backstory.


Sean is Harmon’s oldest child with his wife Pam Dawber, who is also an actor and is best known for her role in the sitcom Mork and Mindy.

The couple also have another son called Ty Harmon who was born in 1992.

Sean is an actor and has appeared in a number of other roles in his career so far.

This includes roles in Major Crimes, Haven: Origins and NCIS: Los Angeles.
Fans will next be able to see him in the television film Thicker Than Thieves, in which he plays Jones.

As well as this, he has also worked as a stuntman and a producer.

His stunt work has included major films like Dumb and Dumber To and American Reunion.

Filming for season 18 of NCIS is set to begin this month in Los Angeles.

This comes after the previous outing was cut short due to the outbreak of coronavirus COVID
Now production is able to begin again, all of the major stars are expected to be back.

No official release date has been given yet but CBS has set a provisional return date of November.

One thing which has been rumoured about the new season is how Maria Bello will be leaving.

Fans will know she plays Jack Sloane on the series and it has been reported by Deadline she will appear in a final eight episodes.

NCIS season 18 is expected to return to CBS later this year.