Mark Harmon’s return as Leroy Jethro Gibbs in NCIS Season 21’s Ducky episode had been a topic of much speculation, but fans were left disappointed when he didn’t appear. The real reason behind his absence is tied to Harmon’s decision to step away from the series. While Gibbs’ character was a central figure for many seasons, Harmon made it clear that he wanted to explore other opportunities and spend more time with his family. The showrunners respected his decision and chose not to force his return, allowing the focus to shift to other characters like Ducky, who had a significant role in the episode.

Although Gibbs’ absence was felt, the episode honored his legacy and continued to explore the impact of his character on the team. Mark Harmon’s departure from the show was a bittersweet moment, as fans had grown deeply attached to Gibbs’ leadership and wisdom. However, the episode served as a reminder of the lasting influence Gibbs had on NCIS, even if the character was no longer physically present. The show continues to evolve without him, but his impact on the series is undeniable.