'NCIS': Mark Harmon Says Episode 400 Is a 'Reward' for the Fans (Exclusive)
Mark Harmon's real-life son, Sean, stepping into young Gibbs' shoes and Adam Campbell playing the youthful Brit.«The fanbase of this show should like this episode. I know when [showrunner] Steve Binder wrote it, it was something he had in mind to, in some ways, reward the audience a little bit -- people who have been tracking this show for as long as they had and highlighting those two characters,» star and executive producer Mark Harmon exclusively told ET's Kevin Frazier.