Over the years, the cast of NCIS has undergone notable transformations, both on-screen and off. Since the show’s premiere in 2003, many of its original stars have evolved in their careers, appearances, and personal lives. As of 2025, these changes are striking, reminding fans of just how long the series has been a part of television history.

Mark Harmon, once the stern and stoic Gibbs, has gracefully stepped into a quieter phase of his career. Though he’s no longer a regular on the show, Harmon remains a central figure in its legacy. His silver hair and more relaxed demeanor reflect the wisdom he brought to the role and his real-life transition from actor to producer.

Sean Murray, who plays McGee, has perhaps changed the most physically. Early in the series, he was youthful and soft-spoken, but today he brings a more seasoned, confident energy to the character. His weight loss and matured presence have made him one of the most visually transformed members of the cast.

Other long-standing stars like David McCallum (Ducky) and Brian Dietzen (Palmer) have each embraced their own journeys, with McCallum’s passing marking a bittersweet turning point for the show. Meanwhile, newer faces have stepped in to carry the torch, showing how NCIS continues to grow while honoring the cast who helped shape its success.