Mark Harmon and Michael Weatherly reunited on the set of NCIS: Origins to film the new series. Harmon returned to his signature role in the production after a period of retirement from the franchise.
The actor also provided narration for the first two years of the show and continues to offer feedback on the scripts. Austin Stowell portrays the younger version of Gibbs, while Mariel Molino appears as Special Agent Lala Dominguez.
Adam Campbell takes on the role of young Ducky, a character previously played by David McCallum for many years. The season follows a serialized story set in 1993 alongside close-ended cases and a mystery of the week.
Plotlines include a fast-progressing romance between Lala and the young Gibbs, a story of a great love that got away, and the development of Gibbs' friendship with Ducky. A moment in the show depicts present-day Gibbs wishing he had reconnected with Ducky.
Emily Wickersham will reprise her role as Ellie Bishop in several episodes beginning 27 October 2026. Harmon appeared in a crossover episode with the original NCIS series.
The series also features a crossover with the original NCIS. Harmon said, "grip it and rip it."
