Mark Harmon has been spotted on the set of the highly anticipated NCIS: Tony & Ziva spinoff, and fans are buzzing with excitement. The sighting marks Harmon’s first public connection to the NCIS franchise since his departure in 2021, reigniting hopes that Special Agent Leroy Jethro Gibbs could be making a return — even if just for a cameo.

According to reports, Harmon was seen interacting warmly with Michael Weatherly and Cote de Pablo between takes, sparking rumors that he may play a pivotal role in the new series. While CBS has not confirmed any official involvement, the actor’s presence on set suggests that the production team could be planning a surprise for longtime viewers.

Social media lit up within hours of the news, with fans sharing theories ranging from a brief Gibbs appearance to a major storyline connecting the spinoff with the original series. Many see Harmon’s visit as a sign that the NCIS universe is still deeply interconnected, and that Gibbs’ story may not be over just yet.

Whether it turns out to be a one-off guest spot or something more substantial, Mark Harmon’s presence on the Tony & Ziva set is already fueling anticipation and adding another layer of intrigue to one of television’s most eagerly awaited spinoffs.