Sean Murray, known for his role on NCIS, has been credited with appearing in more episodes than Mark Harmon, making him second only to David McCallum. Murray has appeared in 438 episodes, a remarkable feat considering his character's growth from a rookie agent to a beloved family man. Fans hope for a reunion with former colleagues, including Cote de Pablo and Michael Weatherly. With the show renewed for Season 21, Murray's character, McGee, is expected to continue, bringing excitement for what's to come in the season finale and beyond. Murray expressed mixed emotions about saying goodbye to Harmon's character, Leroy Jethro Gibbs.