Sean Harmon, the son of NCIS star Mark Harmon, might look familiar—and there’s a good reason for that. Not only does he share his father’s strong jawline and intense stare, but he also portrayed a younger version of Leroy Jethro Gibbs in several flashback scenes on NCIS. His appearances gave fans a touching glimpse into Gibbs’ past and showed just how perfectly Sean inherited his father’s mannerisms and screen presence.

Beyond NCIS, Sean has quietly built a career in Hollywood as both an actor and a stunt coordinator. He’s appeared in shows like CSI: NY and NCIS: Los Angeles, as well as independent films where he’s taken on more diverse roles. While he hasn’t reached the same level of fame as his father, Sean’s behind-the-scenes work in stunts has made him a respected figure in the action world.

His connection to NCIS is more than just a family tie—it’s a legacy moment that fans love. Seeing Sean portray a younger Gibbs was more than clever casting; it was a real-life tribute that added depth to the character and honored the Harmon family’s strong roots in the industry.