‘NCIS’ Fans, We Can’t Believe the News We Just Uncovered About Mark Harmon

It’s official: Mark Harmon is returning to the world of NCIS — just not in the way fans expected. The actor, who famously played Leroy Jethro Gibbs for the show’s first 19 seasons, remains a huge part of the franchise through projects like NCIS: Origins and his brief return as Gibbs in 2025.

Now, Mark is stepping back into the NCIS spotlight by appearing on the NCIS: Partners & Probies podcast with Leon Carroll Jr.. The two will promote their co-written book, Ghosts of Sicily: The True Story of the Naval Intelligence Agents Who Courted the Mob to Fight Nazis in America and the Battlefields of Italy.

Fans were thrilled by the announcement on NCIS’ Instagram, flooding the comments with excitement and nostalgia for Gibbs. Many said they miss Mark on the show and are eager to hear behind-the-scenes stories from his years leading the hit CBS series.