Former "NCIS" star Michael Weatherly (Tony DiNozzo) hasn't lost hope that he will one day reunite with his former TV partner Cote de Pablo (Ziva David). The actor expressed that there's always a possibility of a reunion and he's willing to explore how it can happen.

In a recent interview with Digital Spy, Michael Weatherly said he's never going to say no to an "NCIS" return. But if a reunion with Cote de Pablo can't happen on their former show, she can always drop in on his new series "Bull," which earned a second season renewal for fall.

"She's one of my favorite people," the actor said of his former co-star.

"For eight years, we got to have a lot of fun. Certainly, in terms of chemistry, I've never had anyone like that rattle my brain!"

Both stars bid "NCIS" goodbye in 2013 but Cote de Pablo's Ziva was killed off in the series. Her body, however, wasn't presented, thus opening up a possibility that Ziva could still be alive on the show.

Cast exits and changes

After Michael Weatherly and Cote de Pablo left, the show introduced new cast members like Wilmer Valderrama (Nick Torres), Duane Henry (Clayton Reeves) and Jennifer Esposito (Alex Quinn). The latter, however, expressed she won't be returning for season 15 and the status of the two new actors for next season is still unclear.

Rumors also surfaced the show's lead star Mark Harmon (Jethro Gibbs) might be taking a backseat in the upcoming season, which would eventually lead to his character retiring from the service.

Fans already noticed last year that Gibbs' storylines and presence have been shorter.

Most-watched show worldwide

Meanwhile, the CBS procedural drama retained its status as the most-watched drama series in the world for the last eight years. With an estimated 47 million viewers globally, the show also received the International Audience Award at the recent Monte-Carlo Television Festival.

It beat out other contenders like “The X-Files” and “Criminal Minds.”

"NCIS" is short for Naval Criminal Investigative Service. Its concept was spun off from the drama series "JAG" and was developed by Donald P. Bellisario and Don McGill.

In its initial years, the series would barely top the ratings. By the fourth season, however, the show gained a good following.

Because of its success, CBS decided to spin off two more shows with "NCIS: Los Angeles (2009) and "NCIS: New Orleans" (2014).

The latest season -- its fifteenth year -- will begin airing on CBS on Tuesday, Sept. 26.