Mark Harmon’s absence from the highly anticipated Ducky episode in NCIS Season 21 has left fans wondering about the real reason behind it. While many expected his iconic character, Leroy Jethro Gibbs, to make a return for the special episode celebrating Dr. Donald “Ducky” Mallard, it turns out Harmon’s decision not to appear was a personal one. Harmon, who had been a cornerstone of NCIS for nearly two decades, chose to step back from the show after his character’s exit in Season 19. His decision to keep a low profile and limit his involvement in future episodes was driven by his desire for privacy and a more relaxed lifestyle.

Despite the speculation, the Ducky episode still honored Gibbs’ legacy and kept his presence felt without actually bringing him back to the screen. The episode focused on Ducky’s emotional journey, celebrating his long-standing role in the NCIS team, while subtly acknowledging Gibbs’ influence on both Ducky and the entire team. Fans may have hoped for a reunion, but Harmon’s absence allowed the show to honor his legacy while continuing the story with the characters fans love, ensuring the focus remained on the present dynamics of NCIS.