While Mark Harmon re-immersed himself in the NCIS world recently, his departure from the original series almost tanked the show. Mark, who played Leroy Jethro Gibbs, decided to step down from the show ...

Donald Bellisario and Mark Harmon allegedly butted heads because the leading actor had become upset over the series creator’s ...

He revealed that although the experience "changed [his] direction," it was still "humiliating" for his teenage self ...